webpackJsonp([2],{

/***/ 0:
/***/ function(module, exports, __webpack_require__) {

	__webpack_require__(548);
	__webpack_require__(550);
	module.exports = __webpack_require__(552);


/***/ },

/***/ 548:
/***/ function(module, exports, __webpack_require__) {

	/* WEBPACK VAR INJECTION */(function(global) {module.exports = global["WysijaForm"] = __webpack_require__(549);
	/* WEBPACK VAR INJECTION */}.call(exports, (function() { return this; }())))

/***/ },

/***/ 549:
/***/ function(module, exports) {

	/*
	 * name: MailPoet Form Editor
	 * author: Jonathan Labreuille
	 * company: Wysija
	 * framework: prototype 1.7.2
	 */
	'use strict';

	Event.cacheDelegated = {};
	Object.extend(document, (function() {
	  var cache = Event.cacheDelegated;

	  function getCacheForSelector(selector) {
	    cache[selector] = cache[selector] || {};
	    return cache[selector];
	  }

	  function getWrappersForSelector(selector, eventName) {
	    var c = getCacheForSelector(selector);
	    c[eventName] = c[eventName] || [];
	    return c[eventName];
	  }

	  function findWrapper(selector, eventName, handler) {
	    var c = getWrappersForSelector(selector, eventName);
	    return c.find(function(wrapper) {
	      return wrapper.handler === handler
	    });
	  }

	  function destroyWrapper(selector, eventName, handler) {
	    var c = getCacheForSelector(selector);
	    if(!c[eventName]) return false;
	    var wrapper = findWrapper(selector, eventName, handler)
	    c[eventName] = c[eventName].without(wrapper);
	    return wrapper;
	  }

	  function createWrapper(selector, eventName, handler, context) {
	    var wrapper, c = getWrappersForSelector(selector, eventName);
	    if(c.pluck('handler').include(handler)) return false;
	    wrapper = function(event) {
	      var element = event.findElement(selector);
	      if(element) handler.call(context || element, event, element);
	    };
	    wrapper.handler = handler;
	    c.push(wrapper);
	    return wrapper;
	  }
	  return {
	    delegate: function(selector, eventName, handler, context) {
	      var wrapper = createWrapper.apply(null, arguments);
	      if(wrapper) document.observe(eventName, wrapper);
	      return document;
	    },
	    stopDelegating: function(selector, eventName, handler) {
	      var length = arguments.length;
	      switch(length) {
	        case 2:
	          getWrappersForSelector(selector, eventName).each(function(wrapper) {
	            document.stopDelegating(selector, eventName, wrapper.handler);
	          });
	          break;
	        case 1:
	          Object.keys(getCacheForSelector(selector)).each(function(eventName) {
	            document.stopDelegating(selector, eventName);
	          });
	          break;
	        case 0:
	          Object.keys(cache).each(function(selector) {
	            document.stopDelegating(selector);
	          });
	          break;
	        default:
	          var wrapper = destroyWrapper.apply(null, arguments);
	          if(wrapper) document.stopObserving(eventName, wrapper);
	      }
	      return document;
	    }
	  }
	})());

	var Observable = (function() {
	  function getEventName(nameA, namespace) {
	    var name = nameA.substring(2);
	    if(namespace) name = namespace + ':' + name;
	    return name.underscore().split('_').join(':');
	  }

	  function getHandlers(klass) {
	    var proto = klass.prototype,
	      namespace = proto.namespace;
	    return Object.keys(proto).grep(/^on/).inject($H(), function(handlers, name) {
	      if(name === 'onDomLoaded') return handlers;
	      handlers.set(getEventName(name, namespace), getWrapper(proto[name], klass));
	      return handlers;
	    });
	  }

	  function getWrapper(handler, klass) {
	    return function(event) {
	      return handler.call(new klass(this), event, event.memo);
	    }
	  }

	  function onDomLoad(selector, klass) {
	    $$(selector).each(function(element) {
	      new klass(element).onDomLoaded();
	    });
	  }
	  return {
	    observe: function(selector) {
	      if(!this.handlers) this.handlers = {};
	      if(this.handlers[selector]) return;
	      var klass = this;
	      if(this.prototype.onDomLoaded) document.loaded ? onDomLoad(selector, klass) : document.observe('dom:loaded', onDomLoad.curry(selector, klass));
	      this.handlers[selector] = getHandlers(klass).each(function(handler) {
	        document.delegate(selector, handler.key, handler.value);
	      });
	    },
	    stopObserving: function(selector) {
	      if(!this.handlers || !this.handlers[selector]) return;
	      this.handlers[selector].each(function(handler) {
	        document.stopDelegating(selector, handler.key, handler.value);
	      });
	      delete this.handlers[selector];
	    }
	  }
	})();

	// override droppables
	Object.extend(Droppables, {
	  deactivate: Droppables.deactivate.wrap(function(proceed, drop, draggable) {
	    if(drop.onLeave) drop.onLeave(draggable, drop.element);
	    return proceed(drop);
	  }),
	  activate: Droppables.activate.wrap(function(proceed, drop, draggable) {
	    if(drop.onEnter) drop.onEnter(draggable, drop.element);
	    return proceed(drop);
	  }),
	  show: function(point, element) {
	    if(!this.drops.length) return;
	    var drop, affected = [];
	    this.drops.each(function(drop) {
	      if(Droppables.isAffected(point, element, drop)) affected.push(drop);
	    });
	    if(affected.length > 0) drop = Droppables.findDeepestChild(affected);
	    if(this.last_active && this.last_active !== drop) this.deactivate(this.last_active, element);
	    if(drop) {
	      Position.within(drop.element, point[0], point[1]);
	      if(drop.onHover) drop.onHover(element, drop.element, Position.overlap(drop.overlap, drop.element));
	      if(drop !== this.last_active) Droppables.activate(drop, element);
	    }
	  },
	  displayArea: function(draggable) {
	    if(!this.drops.length) return;

	    // hide controls when displaying drop areas.
	    WysijaForm.hideBlockControls();

	    this.drops.each(function(drop, iterator) {
	      if(drop.element.hasClassName('block_placeholder')) {
	        drop.element.addClassName('active');
	      }
	    });
	  },
	  hideArea: function() {
	    if(!this.drops.length) return;
	    this.drops.each(function(drop, iterator) {
	      if(drop.element.hasClassName('block_placeholder')) {
	        drop.element.removeClassName('active');
	      } else if(drop.element.hasClassName('image_placeholder')) {
	        drop.element.removeClassName('active');
	        drop.element.up().removeClassName('active');
	      } else if(drop.element.hasClassName('text_placeholder')) {
	        drop.element.removeClassName('active');
	      }
	    });
	  },
	  reset: function(draggable) {
	    if(this.last_active) this.deactivate(this.last_active, draggable);
	  }
	});

	/*
	    Wysija History handling
	    POTENTIAL FEATURES:
	        - set a maximum number of items to be stored

	*/
	var WysijaHistory = {
	  container: 'mailpoet_form_history',
	  size: 30,
	  enqueue: function(element) {
	    // create deep clone (includes child elements) of passed element
	    var clone = element.clone(true);

	    // check if the field is unique
	    if(parseInt(clone.readAttribute('wysija_unique'), 10) === 1) {
	      // check if the field is already in the queue
	      $(WysijaHistory.container).select('[wysija_name="' + clone.readAttribute('wysija_name') + '"]').invoke('remove');
	    }

	    // check history size
	    if($(WysijaHistory.container).select('> div').length >= WysijaHistory.size) {
	      // remove oldest element (last in the list)
	      $(WysijaHistory.container).select('> div').last().remove();
	    }

	    // store block in history
	    $(WysijaHistory.container).insert({
	      top: clone
	    });
	  },
	  dequeue: function() {
	    // pop last block off the history
	    var block = $(WysijaHistory.container).select('div').first();

	    if(block !== undefined) {
	      // insert block back into the editor
	      $(WysijaForm.options.body).insert({
	        top: block
	      });
	    }
	  },
	  clear: function() {
	    $(WysijaHistory.container).innerHTML = '';
	  },
	  remove: function(field) {
	    $(WysijaHistory.container).select('[wysija_name="' + field + '"]').invoke('remove');
	  }
	};

	/* MailPoet Form */
	var WysijaForm = {
	  version: '0.7',
	  options: {
	    container: 'mailpoet_form_container',
	    editor: 'mailpoet_form_editor',
	    body: 'mailpoet_form_body',
	    toolbar: 'mailpoet_form_toolbar',
	    templates: 'wysija_widget_templates',
	    debug: false
	  },
	  toolbar: {
	    effect: null,
	    x: null,
	    y: null,
	    top: null,
	    left: null
	  },
	  scroll: {
	    top: 0,
	    left: 0
	  },
	  flags: {
	    doSave: false
	  },
	  locks: {
	    dragging: false,
	    selectingColor: false,
	    showingTools: false
	  },
	  encodeHtmlValue: function(str) {
	    return str.replace(/&/g, '&amp;').replace(/>/g, '&gt;').replace(/</g, '&lt;').replace(/"/g, '&quot;');
	    // ": fix for FileMerge because the previous line fucks up its syntax coloring
	  },
	  decodeHtmlValue: function(str) {
	    return str.replace(/&amp;/g, '&').replace(/&gt;/g, '>').replace(/&lt;/g, '<').replace(/&quot;/g, '"');
	    // ": fix for FileMerge because the previous line fucks up its syntax coloring
	  },
	  loading: function(is_loading) {
	    if(is_loading) {
	      $(WysijaForm.options.editor).addClassName('loading');
	      $(WysijaForm.options.toolbar).addClassName('loading');
	    } else {
	      $(WysijaForm.options.editor).removeClassName('loading');
	      $(WysijaForm.options.toolbar).removeClassName('loading');
	    }
	  },
	  loadStatic: function(blocks) {
	    $A(blocks).each(function(block) {
	      // create block
	      WysijaForm.Block.create(block, $('block_placeholder'));
	    });
	  },
	  load: function(data) {
	    if(data === undefined) return;

	    // load body
	    if(data.body !== undefined) {
	      $A(data.body).each(function(block) {
	        // create block
	        WysijaForm.Block.create(block, $('block_placeholder'));
	      });

	      // load settings
	      var settings_elements = $('mailpoet_form_settings').getElements();
	      settings_elements.each(function(setting) {
	        // skip lists
	        if(setting.name === 'segments') {
	          return true;
	        } else if(setting.name === 'on_success') {
	          // if the input value is equal to the one stored in the settings
	          if(setting.value === data.settings[setting.name]) {
	            // check selected value
	            $(setting).checked = true;
	          }
	        } else if(data.settings[setting.name] !== undefined) {
	          if(typeof data.settings[setting.name] === 'string') {
	            setting.setValue(WysijaForm.decodeHtmlValue(data.settings[setting.name]));
	          } else {
	            setting.setValue(data.settings[setting.name]);
	          }
	        }
	      });
	    }
	  },
	  save: function() {
	    var position = 1,
	      data = {
	        'name': $F('mailpoet_form_name'),
	        'settings': $('mailpoet_form_settings').serialize(true),
	        'body': [],
	        'styles': (MailPoet.CodeEditor !== undefined) ? MailPoet.CodeEditor.getValue() : null
	      };
	    // body
	    WysijaForm.getBlocks().each(function(b) {
	      var block_data = (typeof(b.block['save']) === 'function') ? b.block.save() : null;

	      if(block_data !== null) {
	        // set block position
	        block_data['position'] = position;

	        // increment position
	        position++;

	        // add block data to body
	        data['body'].push(block_data);
	      }
	    });

	    return data;
	  },
	  init: function() {
	    // set document scroll
	    info('init -> set scroll offsets');
	    WysijaForm.setScrollOffsets();

	    // position toolbar
	    info('init -> set toolbar position');
	    WysijaForm.setToolbarPosition();

	    // enable droppable targets
	    info('init -> make droppable');
	    WysijaForm.makeDroppable();

	    // enable sortable
	    info('init -> make sortable');
	    WysijaForm.makeSortable();

	    // hide controls
	    info('init -> hide controls');
	    WysijaForm.hideControls();

	    // hide settings
	    info('init -> hide settings');
	    WysijaForm.hideSettings();

	    // set settings buttons position
	    info('init -> init settings');
	    WysijaForm.setSettingsPosition();

	    // toggle widgets
	    info('init -> toggle widgets');
	    WysijaForm.toggleWidgets();
	  },
	  getFieldData: function(element) {
	    // get basic field data
	    var data = {
	      type: element.readAttribute('wysija_type'),
	      name: element.readAttribute('wysija_name'),
	      id: element.readAttribute('wysija_id'),
	      unique: parseInt(element.readAttribute('wysija_unique') || 0, 10),
	      static: parseInt(element.readAttribute('wysija_static') || 0, 10),
	      element: element,
	      params: ''
	    };

	    // get params (may be empty)
	    if(element.readAttribute('wysija_params') !== null && element.readAttribute('wysija_params').length > 0) {
	      data.params = JSON.parse(element.readAttribute('wysija_params'));
	    }
	    return data;
	  },
	  toggleWidgets: function() {
	    $$('a[wysija_unique="1"]').invoke('removeClassName', 'disabled');

	    // loop through each unique field already inserted in the editor and disable its toolbar equivalent
	    $$('#' + WysijaForm.options.editor + ' [wysija_unique="1"]').map(function(element) {
	      var field = $$('#' + WysijaForm.options.toolbar + ' [wysija_id="' + element.readAttribute('wysija_id') + '"]');
	      if(field.length > 0) {
	        field.first().addClassName('disabled');
	      }
	    });

	    var hasSegmentSelection = WysijaForm.hasSegmentSelection();

	    if(hasSegmentSelection) {
	      $('mailpoet_form_segments').writeAttribute('required', false).disable();
	      $('mailpoet_settings_segment_selection').hide();
	    } else {
	      $('mailpoet_form_segments').writeAttribute('required', true).enable();
	      $('mailpoet_settings_segment_selection').show();
	    }
	  },
	  hasSegmentSelection: function() {
	    return ($$('#' + WysijaForm.options.editor + ' [wysija_id="segments"]').length > 0);
	  },
	  isSegmentSelectionValid: function() {
	    var segment_selection = $$('#' + WysijaForm.options.editor + ' [wysija_id="segments"]')[0];
	    if(segment_selection !== undefined) {
	      var block = WysijaForm.get(segment_selection).block.getData();
	      return (
	        (block.params.values !== undefined)
	        &&
	        (block.params.values.length > 0)
	      );
	    }
	    return false;
	  },
	  setBlockPositions: function(event, target) {
	    // release dragging lock
	    WysijaForm.locks.dragging = false;

	    var index = 1;
	    WysijaForm.getBlocks().each(function(container) {
	      container.setPosition(index++);
	      // remove z-index value to avoid issues when resizing images
	      if(container['block'] !== undefined) {
	        container.block.element.setStyle({
	          zIndex: ''
	        });
	      }
	    });

	    if(target !== undefined) {
	      // get placeholders (previous placeholder matches the placeholder linked to the next block)
	      var block_placeholder = $(target.element.readAttribute('wysija_placeholder')),
	        previous_placeholder = target.element.previous('.block_placeholder');

	      if(block_placeholder !== null) {
	        // put block placeholder before the current block
	        target.element.insert({
	          before: block_placeholder
	        });

	        // if the next block is a wysija_block, insert previous placeholder
	        if(target.element.next() !== undefined && target.element.next().hasClassName('mailpoet_form_block') && previous_placeholder !== undefined) {
	          target.element.insert({
	            after: previous_placeholder
	          });
	        }
	      }
	    }
	  },
	  setScrollOffsets: function() {
	    WysijaForm.scroll = document.viewport.getScrollOffsets();
	  },
	  hideSettings: function() {
	    $(WysijaForm.options.container).select('.wysija_settings').invoke('hide');
	  },
	  setSettingsPosition: function() {
	    // get viewport offsets and dimensions
	    var viewportHeight = document.viewport.getHeight(),
	      blockPadding = 5;

	    $(WysijaForm.options.container).select('.wysija_settings').each(function(element) {
	      // get parent dimensions and position
	      var parentDim = element.up('.mailpoet_form_block').getDimensions(),
	        parentPos = element.up('.mailpoet_form_block').cumulativeOffset(),
	        is_visible = (parentPos.top <= (WysijaForm.scroll.top + viewportHeight)) ? true : false,
	        buttonMargin = 5,
	        relativeTop = buttonMargin;

	      if(is_visible) {
	        // desired position is set to center of viewport
	        var absoluteTop = parseInt(WysijaForm.scroll.top + ((viewportHeight / 2) - (element.getHeight() / 2)), 10),
	          parentTop = parseInt(parentPos.top - blockPadding, 10),
	          parentBottom = parseInt(parentPos.top + parentDim.height - blockPadding, 10);

	        // always center
	        relativeTop = parseInt((parentDim.height / 2) - (element.getHeight() / 2), 10);
	      }
	      // set position for button
	      $(element).setStyle({
	        left: parseInt((parentDim.width / 2) - (element.getWidth() / 2)) + 'px',
	        top: relativeTop + 'px'
	      });
	    });
	  },
	  initToolbarPosition: function() {
	    if(WysijaForm.toolbar.top === null) WysijaForm.toolbar.top = parseInt($(WysijaForm.options.container).positionedOffset().top);
	    if(WysijaForm.toolbar.y === null) WysijaForm.toolbar.y = parseInt(WysijaForm.toolbar.top);

	    if(isRtl) {
	      if(WysijaForm.toolbar.left === null) WysijaForm.toolbar.left = 0;
	    } else {
	      if(WysijaForm.toolbar.left === null) WysijaForm.toolbar.left = parseInt($(WysijaForm.options.container).positionedOffset().left);
	    }
	    if(WysijaForm.toolbar.x === null) WysijaForm.toolbar.x = parseInt(WysijaForm.toolbar.left + $(WysijaForm.options.container).getDimensions().width + 15);

	  },
	  setToolbarPosition: function() {
	    WysijaForm.initToolbarPosition();

	    var position = {
	      top: WysijaForm.toolbar.y + 'px',
	      visibility: 'visible'
	    };

	    if(isRtl) {
	      position.right = WysijaForm.toolbar.x + 'px';
	    } else {
	      position.left = WysijaForm.toolbar.x + 'px';
	    }

	    $(WysijaForm.options.toolbar).setStyle(position);
	  },
	  updateToolbarPosition: function() {
	    // init toolbar position (updates scroll and toolbar y)
	    WysijaForm.initToolbarPosition();

	    // cancel previous effect
	    if(WysijaForm.toolbar.effect !== null) WysijaForm.toolbar.effect.cancel();

	    if(WysijaForm.scroll.top >= (WysijaForm.toolbar.top - 20)) {
	      WysijaForm.toolbar.y = parseInt(20 + WysijaForm.scroll.top);
	      // start effect
	      WysijaForm.toolbar.effect = new Effect.Move(WysijaForm.options.toolbar, {
	        x: WysijaForm.toolbar.x,
	        y: WysijaForm.toolbar.y,
	        mode: 'absolute',
	        duration: 0.2
	      });
	    } else {
	      $(WysijaForm.options.toolbar).setStyle({
	        left: WysijaForm.toolbar.x + 'px',
	        top: WysijaForm.toolbar.top + 'px'
	      });
	    }
	  },
	  blockDropOptions: {
	    accept: $w('mailpoet_form_field'), // acceptable items (classes array)
	    onEnter: function(draggable, droppable) {
	      $(droppable).addClassName('hover');
	    },
	    onLeave: function(draggable, droppable) {
	      $(droppable).removeClassName('hover');
	    },
	    onDrop: function(draggable, droppable) {
	      // custom data for images
	      droppable.fire('wjfe:item:drop', WysijaForm.getFieldData(draggable));
	      $(droppable).removeClassName('hover');
	    }
	  },
	  hideControls: function() {
	    try {
	      return WysijaForm.getBlocks().invoke('hideControls');
	    } catch(e) {
	      return;
	    }
	  },
	  hideTools: function() {
	    $$('.wysija_tools').invoke('hide');
	    WysijaForm.locks.showingTools = false;
	  },
	  instances: {},
	  get: function(element, typ) {
	    var type = typ;
	    if(type === undefined) type = 'block';
	    // identify element
	    var id = element.identify();
	    var instance = WysijaForm.instances[id] || new WysijaForm[type.capitalize().camelize()](id);

	    WysijaForm.instances[id] = instance;
	    return instance;
	  },
	  makeDroppable: function() {
	    Droppables.add('block_placeholder', WysijaForm.blockDropOptions);
	  },
	  makeSortable: function() {
	    var body = $(WysijaForm.options.body);
	    Sortable.create(body, {
	      tag: 'div',
	      only: 'mailpoet_form_block',
	      scroll: window,
	      handle: 'handle',
	      constraint: 'vertical'

	    });
	    Draggables.removeObserver(body);
	    Draggables.addObserver({
	      element: body,
	      onStart: WysijaForm.startBlockPositions,
	      onEnd: WysijaForm.setBlockPositions
	    });
	  },
	  hideBlockControls: function() {
	    $$('.wysija_controls').invoke('hide');
	    this.getBlockElements().invoke('removeClassName', 'hover');
	  },
	  getBlocks: function() {
	    return WysijaForm.getBlockElements().map(function(element) {
	      return WysijaForm.get(element);
	    });
	  },
	  getBlockElements: function() {
	    return $(WysijaForm.options.container).select('.mailpoet_form_block');
	  },
	  startBlockPositions: function(event, target) {
	    if(target.element.hasClassName('mailpoet_form_block')) {
	      // store block placeholder id for the block that is being repositionned
	      if(target.element.previous('.block_placeholder') !== undefined) {
	        target.element.writeAttribute('wysija_placeholder', target.element.previous('.block_placeholder').identify());
	      }
	    }
	    WysijaForm.locks.dragging = true;
	  },
	  encodeURIComponent: function(str) {
	    // check if it's a url and if so, prevent encoding of protocol
	    var regexp = new RegExp(/^http[s]?:\/\//),
	      protocol = regexp.exec(str);

	    if(protocol === null) {
	      // this is not a url so encode the whole thing
	      return encodeURIComponent(str).replace(/[!'()*]/g, escape);
	    } else if(protocol.length === 1) {
	      // this is a url, so do not encode the protocol
	      return encodeURI(str).replace(/[!'()*]/g, escape);
	    }
	  },
	  updateBlock: function(field) {
	    var hasUpdated = false;
	    WysijaForm.getBlocks().each(function(b) {
	      if(b.block.getData().id === field.id) {
	        hasUpdated = true;
	        b.block.redraw(field);
	      }
	    });

	    return hasUpdated;
	  },
	  removeBlock: function(field, callback) {
	    var hasRemoved = false;
	    WysijaForm.getBlocks().each(function(b) {
	      if(b.block.getData().id === field.id) {
	        hasRemoved = true;
	        b.block.removeBlock(callback);
	      }
	    });

	    return hasRemoved;
	  }
	};

	WysijaForm.DraggableItem = Class.create({
	  initialize: function(element) {
	    this.elementType = $(element).readAttribute('wysija_type');
	    this.element = $(element).down() || $(element);
	    this.clone = this.cloneElement();
	    this.insert();
	  },
	  STYLES: new Template('position: absolute; top: #{top}px; left: #{left}px;'),
	  cloneElement: function() {
	    var clone = this.element.clone(),
	      offset = this.element.cumulativeOffset(),
	      list = this.getList(),
	      styles = this.STYLES.evaluate({
	        top: offset.top - list.scrollTop,
	        left: offset.left - list.scrollLeft
	      });
	    clone.setStyle(styles);

	    clone.addClassName('mailpoet_form_widget');
	    clone.addClassName(this.elementType);
	    clone.innerHTML = this.element.innerHTML;
	    return clone;
	  },
	  getOffset: function() {
	    return this.element.offsetTop - this.getList().scrollTop;
	  },
	  getList: function() {
	    return this.element.up('ul');
	  },
	  insert: function() {
	    $$("body")[0].insert(this.clone);
	  },
	  onMousedown: function(event) {
	    var draggable = new Draggable(this.clone, {
	      scroll: window,
	      onStart: function() {
	        Droppables.displayArea(draggable);
	      },
	      onEnd: function(drag) {
	        drag.destroy();
	        drag.element.remove();
	        Droppables.hideArea();
	      },
	      starteffect: function(element) {
	        new Effect.Opacity(element, {
	          duration: 0.2,
	          from: element.getOpacity(),
	          to: 0.7
	        });
	      },
	      endeffect: Prototype.emptyFunction
	    });
	    draggable.initDrag(event);
	    draggable.startDrag(event);
	    return draggable;
	  }
	});
	Object.extend(WysijaForm.DraggableItem, Observable).observe('a[class="mailpoet_form_field"]');


	WysijaForm.Block = Class.create({
	  /* Invoked on load */
	  initialize: function(element) {
	    info('block -> init');

	    this.element = $(element);
	    this.block = new WysijaForm.Widget(this.element);

	    // enable block placeholder
	    this.block.makeBlockDroppable();

	    // setup events
	    if(this.block['setup'] !== undefined) {
	      this.block.setup();
	    }
	    return this;
	  },
	  setPosition: function(position) {
	    this.element.writeAttribute('wysija_position', position);
	  },
	  hideControls: function() {
	    if(this['getControls']) {
	      this.element.removeClassName('hover');
	      this.getControls().hide();
	    }
	  },
	  showControls: function() {
	    if(this['getControls']) {
	      this.element.addClassName('hover');
	      try {
	        this.getControls().show();
	      } catch(e) {;
	      }
	    }
	  },
	  makeBlockDroppable: function() {
	    if(this.isBlockDroppableEnabled() === false) {
	      var block_placeholder = this.getBlockDroppable();
	      Droppables.add(block_placeholder.identify(), WysijaForm.blockDropOptions);
	      block_placeholder.addClassName('enabled');
	    }
	  },
	  removeBlockDroppable: function() {
	    if(this.isBlockDroppableEnabled()) {
	      var block_placeholder = this.getBlockDroppable();
	      Droppables.remove(block_placeholder.identify());
	      block_placeholder.removeClassName('enabled');
	    }
	  },
	  isBlockDroppableEnabled: function() {
	    // if the block_placeholder does not exist, create it
	    var block_placeholder = this.getBlockDroppable();
	    if(block_placeholder === null) {
	      return this.createBlockDroppable().hasClassName('enabled');
	    } else {
	      return block_placeholder.hasClassName('enabled');
	    }
	  },
	  createBlockDroppable: function() {
	    info('block -> createBlockDroppable');
	    this.element.insert({
	      before: '<div class=\"block_placeholder\">' + $('block_placeholder').innerHTML + '</div>'
	    });
	    return this.element.previous('.block_placeholder');
	  },
	  getBlockDroppable: function() {
	    if(this.element.previous() === undefined || this.element.previous().hasClassName('block_placeholder') === false) {
	      return null;
	    } else {
	      return this.element.previous();
	    }
	  },
	  getControls: function() {
	    return this.element.down('.wysija_controls');
	  },
	  setupControls: function() {
	    // enable controls
	    this.controls = this.getControls();

	    if(this.controls) {
	      // setup events for block controls
	      this.element.observe('mouseover', function() {
	        // special cases where controls shouldn't be displayed
	        if(WysijaForm.locks.dragging === true || WysijaForm.locks.selectingColor === true || WysijaForm.locks.showingTools === true) return;

	        // set block flag
	        this.element.addClassName('hover');

	        // show controls
	        this.showControls();

	        // show settings if present
	        if(this.element.down('.wysija_settings') !== undefined) {
	          this.element.down('.wysija_settings').show();
	        }
	      }.bind(this));

	      this.element.observe('mouseout', function() {
	        // special cases where controls shouldn't hide
	        if(WysijaForm.locks.dragging === true || WysijaForm.locks.selectingColor === true) return;

	        // hide controls
	        this.hideControls();

	        // hide settings if present
	        if(this.element.down('.wysija_settings') !== undefined) {
	          this.element.down('.wysija_settings').hide();
	        }
	      }.bind(this));


	      // setup click event for remove button
	      this.removeButton = this.controls.down('.remove') || null;
	      if(this.removeButton !== null) {
	        this.removeButton.observe('click', function() {
	          this.removeBlock();
	          this.removeButton.stopObserving('click');
	        }.bind(this));
	      }

	      // setup click event for settings button
	      this.settingsButton = this.element.down('.settings') || null;

	      if(this.settingsButton !== null) {
	        this.settingsButton.observe('click', function(event) {
	          // TODO: refactor
	          var block = $(event.target).up('.mailpoet_form_block') || null;
	          if(block !== null) {
	            var field = WysijaForm.getFieldData(block);
	            this.editSettings();
	          }
	        }.bind(this));
	      }
	    }
	    return this;
	  },
	  removeBlock: function(callback) {
	    info('block -> removeBlock');

	    // save block in history
	    WysijaHistory.enqueue(this.element);

	    Effect.Fade(this.element.identify(), {
	      duration: 0.2,
	      afterFinish: function(effect) {
	        // remove placeholder
	        if(effect.element.previous('.block_placeholder') !== undefined) {
	          effect.element.previous('.block_placeholder').remove();
	        }

	        // remove element from the DOM
	        this.element.remove();

	        // reset block positions
	        WysijaForm.setBlockPositions();

	        // toggle widgets
	        WysijaForm.toggleWidgets();

	        // optional callback execution after completely removing block
	        if(callback !== undefined && typeof(callback) === 'function') {
	          callback();
	        }

	        // remove block instance
	        delete WysijaForm.instances[this.element.identify()];
	      }.bind(this)
	    });
	  }
	});

	/* Invoked on item dropped */
	WysijaForm.Block.create = function(createBlock, target) {
	  var block = createBlock;
	  if($('form_template_' + block.type) === null) {
	    return false;
	  }

	  var body = $(WysijaForm.options.body),
	    block_template = Handlebars.compile($('form_template_block').innerHTML),
	    template = Handlebars.compile($('form_template_' + block.type).innerHTML),
	    output = '';

	  if(block.type === 'segment') {
	    if(block.params.values === undefined) {
	      var settings_segments = jQuery('#mailpoet_form_segments').val();
	      if(settings_segments !== null && settings_segments.length > 0){
	        block.params.values = mailpoet_segments.filter(function(segment) {
	          return (settings_segments.indexOf(segment.id) !== -1);
	        });
	      }
	    }
	  }

	  // set block template (depending on the block type)
	  block.template = template(block);
	  output = block_template(block);

	  // check if the new block is unique and if there's already an instance
	  // of it in the history. If so, remove its former instance from the history
	  if(block.unique === 1) {
	    WysijaHistory.remove(block.field);
	  }

	  // if the drop target was the bottom placeholder
	  var element = null;
	  if(target.identify() === 'block_placeholder') {
	    // insert block at the bottom
	    element = body.insert(output);
	    //block = body.childElements().last();
	  } else {
	    // insert block before the drop target
	    element = target.insert({
	      before: output
	    });
	    //block = target.previous('.mailpoet_form_block');
	  }
	  // refresh sortable items
	  WysijaForm.makeSortable();

	  // refresh block positions
	  WysijaForm.setBlockPositions();

	  // position settings
	  WysijaForm.setSettingsPosition();
	};

	document.observe('wjfe:item:drop', function(event) {
	  info('create block');
	  WysijaForm.Block.create(event.memo, event.target);

	  // hide block controls
	  info('hide controls');
	  WysijaForm.hideBlockControls();

	  // toggle widgets
	  setTimeout(function() {
	    WysijaForm.toggleWidgets();
	  }, 1);
	});

	/* Form Widget */
	WysijaForm.Widget = Class.create(WysijaForm.Block, {
	  initialize: function(element) {
	    info('widget -> init');
	    this.element = $(element);
	    return this;
	  },
	  setup: function() {
	    info('widget -> setup');
	    this.setupControls();
	  },
	  save: function() {
	    info('widget -> save');
	    var data = this.getData();

	    if(data.element !== undefined) {
	      delete data.element;
	    }

	    return data;
	  },
	  setData: function(data) {
	    var current_data = this.getData(),
	      params = $H(current_data.params).merge(data.params).toObject();

	    // update type if it changed
	    if(data.type !== undefined && data.type !== current_data.type) {
	      this.element.writeAttribute('wysija_type', data.type);
	    }

	    // update params
	    this.element.writeAttribute('wysija_params', JSON.stringify(params));
	  },
	  getData: function() {
	    var data = WysijaForm.getFieldData(this.element);
	    // decode params
	    if(data.params.length > 0) {
	      data.params = JSON.parse(data.params);
	    }
	    return data;
	  },
	  getControls: function() {
	    return this.element.down('.wysija_controls');
	  },
	  remove: function() {
	    this.removeBlock();
	  },
	  redraw: function(data) {
	    // set parameters
	    this.setData(data);
	    var options = this.getData();
	    // redraw block
	    var block_template = Handlebars.compile($('form_template_block').innerHTML),
	      template = Handlebars.compile($('form_template_' + options.type).innerHTML),
	      data = $H(options).merge({
	        template: template(options)
	      }).toObject();
	    this.element.replace(block_template(data));

	    WysijaForm.init();
	  },
	  editSettings: function() {
	    MailPoet.Modal.popup({
	      title: MailPoet.I18n.t('editFieldSettings'),
	      template: jQuery('#form_template_field_settings').html(),
	      data: this.getData(),
	      onSuccess: function() {
	        var data = jQuery('#form_field_settings').serializeObject();
	        this.redraw(data);
	      }.bind(this)
	    });
	  },
	  getSettings: function() {
	    return this.element.down('.wysija_settings');
	  }
	});

	/* When dom is loaded, initialize WysijaForm */
	document.observe('dom:loaded', WysijaForm.init);

	/* LOGGING */
	function info(value) {
	  if(WysijaForm.options.debug === false) return;

	  if(!(window.console && console.log)) {
	    (function() {
	      var noop = function() {};
	      var methods = ['assert', 'clear', 'count', 'debug', 'dir', 'dirxml', 'error', 'exception', 'group', 'groupCollapsed', 'groupEnd', 'info', 'log', 'markTimeline', 'profile', 'profileEnd', 'markTimeline', 'table', 'time', 'timeEnd', 'timeStamp', 'trace', 'warn'];
	      var length = methods.length;
	      window.console = {};
	      var console = {};
	      while(length--) {
	        console[methods[length]] = noop;
	      }
	    }());
	  }
	  try {
	    console.log('[DEBUG] ' + value);
	  } catch(e) {}
	}

	module.exports = WysijaForm;


/***/ },

/***/ 550:
/***/ function(module, exports, __webpack_require__) {

	/* WEBPACK VAR INJECTION */(function(global) {module.exports = global["CodeMirror"] = __webpack_require__(551);
	/* WEBPACK VAR INJECTION */}.call(exports, (function() { return this; }())))

/***/ },

/***/ 551:
/***/ function(module, exports, __webpack_require__) {

	// CodeMirror, copyright (c) by Marijn Haverbeke and others
	// Distributed under an MIT license: http://codemirror.net/LICENSE

	// This is CodeMirror (http://codemirror.net), a code editor
	// implemented in JavaScript on top of the browser's DOM.
	//
	// You can find some technical background for some of the code below
	// at http://marijnhaverbeke.nl/blog/#cm-internals .

	(function (global, factory) {
		 true ? module.exports = factory() :
		typeof define === 'function' && define.amd ? define(factory) :
		(global.CodeMirror = factory());
	}(this, (function () { 'use strict';

	// Kludges for bugs and behavior differences that can't be feature
	// detected are enabled based on userAgent etc sniffing.
	var userAgent = navigator.userAgent;
	var platform = navigator.platform;

	var gecko = /gecko\/\d/i.test(userAgent);
	var ie_upto10 = /MSIE \d/.test(userAgent);
	var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(userAgent);
	var edge = /Edge\/(\d+)/.exec(userAgent);
	var ie = ie_upto10 || ie_11up || edge;
	var ie_version = ie && (ie_upto10 ? document.documentMode || 6 : +(edge || ie_11up)[1]);
	var webkit = !edge && /WebKit\//.test(userAgent);
	var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(userAgent);
	var chrome = !edge && /Chrome\//.test(userAgent);
	var presto = /Opera\//.test(userAgent);
	var safari = /Apple Computer/.test(navigator.vendor);
	var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(userAgent);
	var phantom = /PhantomJS/.test(userAgent);

	var ios = !edge && /AppleWebKit/.test(userAgent) && /Mobile\/\w+/.test(userAgent);
	var android = /Android/.test(userAgent);
	// This is woefully incomplete. Suggestions for alternative methods welcome.
	var mobile = ios || android || /webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent);
	var mac = ios || /Mac/.test(platform);
	var chromeOS = /\bCrOS\b/.test(userAgent);
	var windows = /win/i.test(platform);

	var presto_version = presto && userAgent.match(/Version\/(\d*\.\d*)/);
	if (presto_version) { presto_version = Number(presto_version[1]); }
	if (presto_version && presto_version >= 15) { presto = false; webkit = true; }
	// Some browsers use the wrong event properties to signal cmd/ctrl on OS X
	var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11));
	var captureRightClick = gecko || (ie && ie_version >= 9);

	function classTest(cls) { return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*") }

	var rmClass = function(node, cls) {
	  var current = node.className;
	  var match = classTest(cls).exec(current);
	  if (match) {
	    var after = current.slice(match.index + match[0].length);
	    node.className = current.slice(0, match.index) + (after ? match[1] + after : "");
	  }
	};

	function removeChildren(e) {
	  for (var count = e.childNodes.length; count > 0; --count)
	    { e.removeChild(e.firstChild); }
	  return e
	}

	function removeChildrenAndAdd(parent, e) {
	  return removeChildren(parent).appendChild(e)
	}

	function elt(tag, content, className, style) {
	  var e = document.createElement(tag);
	  if (className) { e.className = className; }
	  if (style) { e.style.cssText = style; }
	  if (typeof content == "string") { e.appendChild(document.createTextNode(content)); }
	  else if (content) { for (var i = 0; i < content.length; ++i) { e.appendChild(content[i]); } }
	  return e
	}
	// wrapper for elt, which removes the elt from the accessibility tree
	function eltP(tag, content, className, style) {
	  var e = elt(tag, content, className, style);
	  e.setAttribute("role", "presentation");
	  return e
	}

	var range;
	if (document.createRange) { range = function(node, start, end, endNode) {
	  var r = document.createRange();
	  r.setEnd(endNode || node, end);
	  r.setStart(node, start);
	  return r
	}; }
	else { range = function(node, start, end) {
	  var r = document.body.createTextRange();
	  try { r.moveToElementText(node.parentNode); }
	  catch(e) { return r }
	  r.collapse(true);
	  r.moveEnd("character", end);
	  r.moveStart("character", start);
	  return r
	}; }

	function contains(parent, child) {
	  if (child.nodeType == 3) // Android browser always returns false when child is a textnode
	    { child = child.parentNode; }
	  if (parent.contains)
	    { return parent.contains(child) }
	  do {
	    if (child.nodeType == 11) { child = child.host; }
	    if (child == parent) { return true }
	  } while (child = child.parentNode)
	}

	function activeElt() {
	  // IE and Edge may throw an "Unspecified Error" when accessing document.activeElement.
	  // IE < 10 will throw when accessed while the page is loading or in an iframe.
	  // IE > 9 and Edge will throw when accessed in an iframe if document.body is unavailable.
	  var activeElement;
	  try {
	    activeElement = document.activeElement;
	  } catch(e) {
	    activeElement = document.body || null;
	  }
	  while (activeElement && activeElement.shadowRoot && activeElement.shadowRoot.activeElement)
	    { activeElement = activeElement.shadowRoot.activeElement; }
	  return activeElement
	}

	function addClass(node, cls) {
	  var current = node.className;
	  if (!classTest(cls).test(current)) { node.className += (current ? " " : "") + cls; }
	}
	function joinClasses(a, b) {
	  var as = a.split(" ");
	  for (var i = 0; i < as.length; i++)
	    { if (as[i] && !classTest(as[i]).test(b)) { b += " " + as[i]; } }
	  return b
	}

	var selectInput = function(node) { node.select(); };
	if (ios) // Mobile Safari apparently has a bug where select() is broken.
	  { selectInput = function(node) { node.selectionStart = 0; node.selectionEnd = node.value.length; }; }
	else if (ie) // Suppress mysterious IE10 errors
	  { selectInput = function(node) { try { node.select(); } catch(_e) {} }; }

	function bind(f) {
	  var args = Array.prototype.slice.call(arguments, 1);
	  return function(){return f.apply(null, args)}
	}

	function copyObj(obj, target, overwrite) {
	  if (!target) { target = {}; }
	  for (var prop in obj)
	    { if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop)))
	      { target[prop] = obj[prop]; } }
	  return target
	}

	// Counts the column offset in a string, taking tabs into account.
	// Used mostly to find indentation.
	function countColumn(string, end, tabSize, startIndex, startValue) {
	  if (end == null) {
	    end = string.search(/[^\s\u00a0]/);
	    if (end == -1) { end = string.length; }
	  }
	  for (var i = startIndex || 0, n = startValue || 0;;) {
	    var nextTab = string.indexOf("\t", i);
	    if (nextTab < 0 || nextTab >= end)
	      { return n + (end - i) }
	    n += nextTab - i;
	    n += tabSize - (n % tabSize);
	    i = nextTab + 1;
	  }
	}

	var Delayed = function() {this.id = null;};
	Delayed.prototype.set = function (ms, f) {
	  clearTimeout(this.id);
	  this.id = setTimeout(f, ms);
	};

	function indexOf(array, elt) {
	  for (var i = 0; i < array.length; ++i)
	    { if (array[i] == elt) { return i } }
	  return -1
	}

	// Number of pixels added to scroller and sizer to hide scrollbar
	var scrollerGap = 30;

	// Returned or thrown by various protocols to signal 'I'm not
	// handling this'.
	var Pass = {toString: function(){return "CodeMirror.Pass"}};

	// Reused option objects for setSelection & friends
	var sel_dontScroll = {scroll: false};
	var sel_mouse = {origin: "*mouse"};
	var sel_move = {origin: "+move"};

	// The inverse of countColumn -- find the offset that corresponds to
	// a particular column.
	function findColumn(string, goal, tabSize) {
	  for (var pos = 0, col = 0;;) {
	    var nextTab = string.indexOf("\t", pos);
	    if (nextTab == -1) { nextTab = string.length; }
	    var skipped = nextTab - pos;
	    if (nextTab == string.length || col + skipped >= goal)
	      { return pos + Math.min(skipped, goal - col) }
	    col += nextTab - pos;
	    col += tabSize - (col % tabSize);
	    pos = nextTab + 1;
	    if (col >= goal) { return pos }
	  }
	}

	var spaceStrs = [""];
	function spaceStr(n) {
	  while (spaceStrs.length <= n)
	    { spaceStrs.push(lst(spaceStrs) + " "); }
	  return spaceStrs[n]
	}

	function lst(arr) { return arr[arr.length-1] }

	function map(array, f) {
	  var out = [];
	  for (var i = 0; i < array.length; i++) { out[i] = f(array[i], i); }
	  return out
	}

	function insertSorted(array, value, score) {
	  var pos = 0, priority = score(value);
	  while (pos < array.length && score(array[pos]) <= priority) { pos++; }
	  array.splice(pos, 0, value);
	}

	function nothing() {}

	function createObj(base, props) {
	  var inst;
	  if (Object.create) {
	    inst = Object.create(base);
	  } else {
	    nothing.prototype = base;
	    inst = new nothing();
	  }
	  if (props) { copyObj(props, inst); }
	  return inst
	}

	var nonASCIISingleCaseWordChar = /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;
	function isWordCharBasic(ch) {
	  return /\w/.test(ch) || ch > "\x80" &&
	    (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch))
	}
	function isWordChar(ch, helper) {
	  if (!helper) { return isWordCharBasic(ch) }
	  if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) { return true }
	  return helper.test(ch)
	}

	function isEmpty(obj) {
	  for (var n in obj) { if (obj.hasOwnProperty(n) && obj[n]) { return false } }
	  return true
	}

	// Extending unicode characters. A series of a non-extending char +
	// any number of extending chars is treated as a single unit as far
	// as editing and measuring is concerned. This is not fully correct,
	// since some scripts/fonts/browsers also treat other configurations
	// of code points as a group.
	var extendingChars = /[\u0300-\u036f\u0483-\u0489\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u065e\u0670\u06d6-\u06dc\u06de-\u06e4\u06e7\u06e8\u06ea-\u06ed\u0711\u0730-\u074a\u07a6-\u07b0\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0900-\u0902\u093c\u0941-\u0948\u094d\u0951-\u0955\u0962\u0963\u0981\u09bc\u09be\u09c1-\u09c4\u09cd\u09d7\u09e2\u09e3\u0a01\u0a02\u0a3c\u0a41\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a70\u0a71\u0a75\u0a81\u0a82\u0abc\u0ac1-\u0ac5\u0ac7\u0ac8\u0acd\u0ae2\u0ae3\u0b01\u0b3c\u0b3e\u0b3f\u0b41-\u0b44\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b82\u0bbe\u0bc0\u0bcd\u0bd7\u0c3e-\u0c40\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0cbc\u0cbf\u0cc2\u0cc6\u0ccc\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0d3e\u0d41-\u0d44\u0d4d\u0d57\u0d62\u0d63\u0dca\u0dcf\u0dd2-\u0dd4\u0dd6\u0ddf\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0f18\u0f19\u0f35\u0f37\u0f39\u0f71-\u0f7e\u0f80-\u0f84\u0f86\u0f87\u0f90-\u0f97\u0f99-\u0fbc\u0fc6\u102d-\u1030\u1032-\u1037\u1039\u103a\u103d\u103e\u1058\u1059\u105e-\u1060\u1071-\u1074\u1082\u1085\u1086\u108d\u109d\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b7-\u17bd\u17c6\u17c9-\u17d3\u17dd\u180b-\u180d\u18a9\u1920-\u1922\u1927\u1928\u1932\u1939-\u193b\u1a17\u1a18\u1a56\u1a58-\u1a5e\u1a60\u1a62\u1a65-\u1a6c\u1a73-\u1a7c\u1a7f\u1b00-\u1b03\u1b34\u1b36-\u1b3a\u1b3c\u1b42\u1b6b-\u1b73\u1b80\u1b81\u1ba2-\u1ba5\u1ba8\u1ba9\u1c2c-\u1c33\u1c36\u1c37\u1cd0-\u1cd2\u1cd4-\u1ce0\u1ce2-\u1ce8\u1ced\u1dc0-\u1de6\u1dfd-\u1dff\u200c\u200d\u20d0-\u20f0\u2cef-\u2cf1\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua66f-\ua672\ua67c\ua67d\ua6f0\ua6f1\ua802\ua806\ua80b\ua825\ua826\ua8c4\ua8e0-\ua8f1\ua926-\ua92d\ua947-\ua951\ua980-\ua982\ua9b3\ua9b6-\ua9b9\ua9bc\uaa29-\uaa2e\uaa31\uaa32\uaa35\uaa36\uaa43\uaa4c\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uabe5\uabe8\uabed\udc00-\udfff\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\uff9e\uff9f]/;
	function isExtendingChar(ch) { return ch.charCodeAt(0) >= 768 && extendingChars.test(ch) }

	// Returns a number from the range [`0`; `str.length`] unless `pos` is outside that range.
	function skipExtendingChars(str, pos, dir) {
	  while ((dir < 0 ? pos > 0 : pos < str.length) && isExtendingChar(str.charAt(pos))) { pos += dir; }
	  return pos
	}

	// Returns the value from the range [`from`; `to`] that satisfies
	// `pred` and is closest to `from`. Assumes that at least `to` satisfies `pred`.
	function findFirst(pred, from, to) {
	  for (;;) {
	    if (Math.abs(from - to) <= 1) { return pred(from) ? from : to }
	    var mid = Math.floor((from + to) / 2);
	    if (pred(mid)) { to = mid; }
	    else { from = mid; }
	  }
	}

	// The display handles the DOM integration, both for input reading
	// and content drawing. It holds references to DOM nodes and
	// display-related state.

	function Display(place, doc, input) {
	  var d = this;
	  this.input = input;

	  // Covers bottom-right square when both scrollbars are present.
	  d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
	  d.scrollbarFiller.setAttribute("cm-not-content", "true");
	  // Covers bottom of gutter when coverGutterNextToScrollbar is on
	  // and h scrollbar is present.
	  d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
	  d.gutterFiller.setAttribute("cm-not-content", "true");
	  // Will contain the actual code, positioned to cover the viewport.
	  d.lineDiv = eltP("div", null, "CodeMirror-code");
	  // Elements are added to these to represent selection and cursors.
	  d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
	  d.cursorDiv = elt("div", null, "CodeMirror-cursors");
	  // A visibility: hidden element used to find the size of things.
	  d.measure = elt("div", null, "CodeMirror-measure");
	  // When lines outside of the viewport are measured, they are drawn in this.
	  d.lineMeasure = elt("div", null, "CodeMirror-measure");
	  // Wraps everything that needs to exist inside the vertically-padded coordinate system
	  d.lineSpace = eltP("div", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],
	                    null, "position: relative; outline: none");
	  var lines = eltP("div", [d.lineSpace], "CodeMirror-lines");
	  // Moved around its parent to cover visible view.
	  d.mover = elt("div", [lines], null, "position: relative");
	  // Set to the height of the document, allowing scrolling.
	  d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
	  d.sizerWidth = null;
	  // Behavior of elts with overflow: auto and padding is
	  // inconsistent across browsers. This is used to ensure the
	  // scrollable area is big enough.
	  d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerGap + "px; width: 1px;");
	  // Will contain the gutters, if any.
	  d.gutters = elt("div", null, "CodeMirror-gutters");
	  d.lineGutter = null;
	  // Actual scrollable element.
	  d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll");
	  d.scroller.setAttribute("tabIndex", "-1");
	  // The element in which the editor lives.
	  d.wrapper = elt("div", [d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");

	  // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)
	  if (ie && ie_version < 8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }
	  if (!webkit && !(gecko && mobile)) { d.scroller.draggable = true; }

	  if (place) {
	    if (place.appendChild) { place.appendChild(d.wrapper); }
	    else { place(d.wrapper); }
	  }

	  // Current rendered range (may be bigger than the view window).
	  d.viewFrom = d.viewTo = doc.first;
	  d.reportedViewFrom = d.reportedViewTo = doc.first;
	  // Information about the rendered lines.
	  d.view = [];
	  d.renderedView = null;
	  // Holds info about a single rendered line when it was rendered
	  // for measurement, while not in view.
	  d.externalMeasured = null;
	  // Empty space (in pixels) above the view
	  d.viewOffset = 0;
	  d.lastWrapHeight = d.lastWrapWidth = 0;
	  d.updateLineNumbers = null;

	  d.nativeBarWidth = d.barHeight = d.barWidth = 0;
	  d.scrollbarsClipped = false;

	  // Used to only resize the line number gutter when necessary (when
	  // the amount of lines crosses a boundary that makes its width change)
	  d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
	  // Set to true when a non-horizontal-scrolling line widget is
	  // added. As an optimization, line widget aligning is skipped when
	  // this is false.
	  d.alignWidgets = false;

	  d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;

	  // Tracks the maximum line length so that the horizontal scrollbar
	  // can be kept static when scrolling.
	  d.maxLine = null;
	  d.maxLineLength = 0;
	  d.maxLineChanged = false;

	  // Used for measuring wheel scrolling granularity
	  d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;

	  // True when shift is held down.
	  d.shift = false;

	  // Used to track whether anything happened since the context menu
	  // was opened.
	  d.selForContextMenu = null;

	  d.activeTouch = null;

	  input.init(d);
	}

	// Find the line object corresponding to the given line number.
	function getLine(doc, n) {
	  n -= doc.first;
	  if (n < 0 || n >= doc.size) { throw new Error("There is no line " + (n + doc.first) + " in the document.") }
	  var chunk = doc;
	  while (!chunk.lines) {
	    for (var i = 0;; ++i) {
	      var child = chunk.children[i], sz = child.chunkSize();
	      if (n < sz) { chunk = child; break }
	      n -= sz;
	    }
	  }
	  return chunk.lines[n]
	}

	// Get the part of a document between two positions, as an array of
	// strings.
	function getBetween(doc, start, end) {
	  var out = [], n = start.line;
	  doc.iter(start.line, end.line + 1, function (line) {
	    var text = line.text;
	    if (n == end.line) { text = text.slice(0, end.ch); }
	    if (n == start.line) { text = text.slice(start.ch); }
	    out.push(text);
	    ++n;
	  });
	  return out
	}
	// Get the lines between from and to, as array of strings.
	function getLines(doc, from, to) {
	  var out = [];
	  doc.iter(from, to, function (line) { out.push(line.text); }); // iter aborts when callback returns truthy value
	  return out
	}

	// Update the height of a line, propagating the height change
	// upwards to parent nodes.
	function updateLineHeight(line, height) {
	  var diff = height - line.height;
	  if (diff) { for (var n = line; n; n = n.parent) { n.height += diff; } }
	}

	// Given a line object, find its line number by walking up through
	// its parent links.
	function lineNo(line) {
	  if (line.parent == null) { return null }
	  var cur = line.parent, no = indexOf(cur.lines, line);
	  for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
	    for (var i = 0;; ++i) {
	      if (chunk.children[i] == cur) { break }
	      no += chunk.children[i].chunkSize();
	    }
	  }
	  return no + cur.first
	}

	// Find the line at the given vertical position, using the height
	// information in the document tree.
	function lineAtHeight(chunk, h) {
	  var n = chunk.first;
	  outer: do {
	    for (var i$1 = 0; i$1 < chunk.children.length; ++i$1) {
	      var child = chunk.children[i$1], ch = child.height;
	      if (h < ch) { chunk = child; continue outer }
	      h -= ch;
	      n += child.chunkSize();
	    }
	    return n
	  } while (!chunk.lines)
	  var i = 0;
	  for (; i < chunk.lines.length; ++i) {
	    var line = chunk.lines[i], lh = line.height;
	    if (h < lh) { break }
	    h -= lh;
	  }
	  return n + i
	}

	function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size}

	function lineNumberFor(options, i) {
	  return String(options.lineNumberFormatter(i + options.firstLineNumber))
	}

	// A Pos instance represents a position within the text.
	function Pos(line, ch, sticky) {
	  if ( sticky === void 0 ) sticky = null;

	  if (!(this instanceof Pos)) { return new Pos(line, ch, sticky) }
	  this.line = line;
	  this.ch = ch;
	  this.sticky = sticky;
	}

	// Compare two positions, return 0 if they are the same, a negative
	// number when a is less, and a positive number otherwise.
	function cmp(a, b) { return a.line - b.line || a.ch - b.ch }

	function equalCursorPos(a, b) { return a.sticky == b.sticky && cmp(a, b) == 0 }

	function copyPos(x) {return Pos(x.line, x.ch)}
	function maxPos(a, b) { return cmp(a, b) < 0 ? b : a }
	function minPos(a, b) { return cmp(a, b) < 0 ? a : b }

	// Most of the external API clips given positions to make sure they
	// actually exist within the document.
	function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1))}
	function clipPos(doc, pos) {
	  if (pos.line < doc.first) { return Pos(doc.first, 0) }
	  var last = doc.first + doc.size - 1;
	  if (pos.line > last) { return Pos(last, getLine(doc, last).text.length) }
	  return clipToLen(pos, getLine(doc, pos.line).text.length)
	}
	function clipToLen(pos, linelen) {
	  var ch = pos.ch;
	  if (ch == null || ch > linelen) { return Pos(pos.line, linelen) }
	  else if (ch < 0) { return Pos(pos.line, 0) }
	  else { return pos }
	}
	function clipPosArray(doc, array) {
	  var out = [];
	  for (var i = 0; i < array.length; i++) { out[i] = clipPos(doc, array[i]); }
	  return out
	}

	// Optimize some code when these features are not used.
	var sawReadOnlySpans = false;
	var sawCollapsedSpans = false;

	function seeReadOnlySpans() {
	  sawReadOnlySpans = true;
	}

	function seeCollapsedSpans() {
	  sawCollapsedSpans = true;
	}

	// TEXTMARKER SPANS

	function MarkedSpan(marker, from, to) {
	  this.marker = marker;
	  this.from = from; this.to = to;
	}

	// Search an array of spans for a span matching the given marker.
	function getMarkedSpanFor(spans, marker) {
	  if (spans) { for (var i = 0; i < spans.length; ++i) {
	    var span = spans[i];
	    if (span.marker == marker) { return span }
	  } }
	}
	// Remove a span from an array, returning undefined if no spans are
	// left (we don't store arrays for lines without spans).
	function removeMarkedSpan(spans, span) {
	  var r;
	  for (var i = 0; i < spans.length; ++i)
	    { if (spans[i] != span) { (r || (r = [])).push(spans[i]); } }
	  return r
	}
	// Add a span to a line.
	function addMarkedSpan(line, span) {
	  line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];
	  span.marker.attachLine(line);
	}

	// Used for the algorithm that adjusts markers for a change in the
	// document. These functions cut an array of spans at a given
	// character position, returning an array of remaining chunks (or
	// undefined if nothing remains).
	function markedSpansBefore(old, startCh, isInsert) {
	  var nw;
	  if (old) { for (var i = 0; i < old.length; ++i) {
	    var span = old[i], marker = span.marker;
	    var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);
	    if (startsBefore || span.from == startCh && marker.type == "bookmark" && (!isInsert || !span.marker.insertLeft)) {
	      var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh);(nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to));
	    }
	  } }
	  return nw
	}
	function markedSpansAfter(old, endCh, isInsert) {
	  var nw;
	  if (old) { for (var i = 0; i < old.length; ++i) {
	    var span = old[i], marker = span.marker;
	    var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);
	    if (endsAfter || span.from == endCh && marker.type == "bookmark" && (!isInsert || span.marker.insertLeft)) {
	      var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh);(nw || (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,
	                                            span.to == null ? null : span.to - endCh));
	    }
	  } }
	  return nw
	}

	// Given a change object, compute the new set of marker spans that
	// cover the line in which the change took place. Removes spans
	// entirely within the change, reconnects spans belonging to the
	// same marker that appear on both sides of the change, and cuts off
	// spans partially within the change. Returns an array of span
	// arrays with one element for each line in (after) the change.
	function stretchSpansOverChange(doc, change) {
	  if (change.full) { return null }
	  var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;
	  var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;
	  if (!oldFirst && !oldLast) { return null }

	  var startCh = change.from.ch, endCh = change.to.ch, isInsert = cmp(change.from, change.to) == 0;
	  // Get the spans that 'stick out' on both sides
	  var first = markedSpansBefore(oldFirst, startCh, isInsert);
	  var last = markedSpansAfter(oldLast, endCh, isInsert);

	  // Next, merge those two ends
	  var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0);
	  if (first) {
	    // Fix up .to properties of first
	    for (var i = 0; i < first.length; ++i) {
	      var span = first[i];
	      if (span.to == null) {
	        var found = getMarkedSpanFor(last, span.marker);
	        if (!found) { span.to = startCh; }
	        else if (sameLine) { span.to = found.to == null ? null : found.to + offset; }
	      }
	    }
	  }
	  if (last) {
	    // Fix up .from in last (or move them into first in case of sameLine)
	    for (var i$1 = 0; i$1 < last.length; ++i$1) {
	      var span$1 = last[i$1];
	      if (span$1.to != null) { span$1.to += offset; }
	      if (span$1.from == null) {
	        var found$1 = getMarkedSpanFor(first, span$1.marker);
	        if (!found$1) {
	          span$1.from = offset;
	          if (sameLine) { (first || (first = [])).push(span$1); }
	        }
	      } else {
	        span$1.from += offset;
	        if (sameLine) { (first || (first = [])).push(span$1); }
	      }
	    }
	  }
	  // Make sure we didn't create any zero-length spans
	  if (first) { first = clearEmptySpans(first); }
	  if (last && last != first) { last = clearEmptySpans(last); }

	  var newMarkers = [first];
	  if (!sameLine) {
	    // Fill gap with whole-line-spans
	    var gap = change.text.length - 2, gapMarkers;
	    if (gap > 0 && first)
	      { for (var i$2 = 0; i$2 < first.length; ++i$2)
	        { if (first[i$2].to == null)
	          { (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i$2].marker, null, null)); } } }
	    for (var i$3 = 0; i$3 < gap; ++i$3)
	      { newMarkers.push(gapMarkers); }
	    newMarkers.push(last);
	  }
	  return newMarkers
	}

	// Remove spans that are empty and don't have a clearWhenEmpty
	// option of false.
	function clearEmptySpans(spans) {
	  for (var i = 0; i < spans.length; ++i) {
	    var span = spans[i];
	    if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false)
	      { spans.splice(i--, 1); }
	  }
	  if (!spans.length) { return null }
	  return spans
	}

	// Used to 'clip' out readOnly ranges when making a change.
	function removeReadOnlyRanges(doc, from, to) {
	  var markers = null;
	  doc.iter(from.line, to.line + 1, function (line) {
	    if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {
	      var mark = line.markedSpans[i].marker;
	      if (mark.readOnly && (!markers || indexOf(markers, mark) == -1))
	        { (markers || (markers = [])).push(mark); }
	    } }
	  });
	  if (!markers) { return null }
	  var parts = [{from: from, to: to}];
	  for (var i = 0; i < markers.length; ++i) {
	    var mk = markers[i], m = mk.find(0);
	    for (var j = 0; j < parts.length; ++j) {
	      var p = parts[j];
	      if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) { continue }
	      var newParts = [j, 1], dfrom = cmp(p.from, m.from), dto = cmp(p.to, m.to);
	      if (dfrom < 0 || !mk.inclusiveLeft && !dfrom)
	        { newParts.push({from: p.from, to: m.from}); }
	      if (dto > 0 || !mk.inclusiveRight && !dto)
	        { newParts.push({from: m.to, to: p.to}); }
	      parts.splice.apply(parts, newParts);
	      j += newParts.length - 3;
	    }
	  }
	  return parts
	}

	// Connect or disconnect spans from a line.
	function detachMarkedSpans(line) {
	  var spans = line.markedSpans;
	  if (!spans) { return }
	  for (var i = 0; i < spans.length; ++i)
	    { spans[i].marker.detachLine(line); }
	  line.markedSpans = null;
	}
	function attachMarkedSpans(line, spans) {
	  if (!spans) { return }
	  for (var i = 0; i < spans.length; ++i)
	    { spans[i].marker.attachLine(line); }
	  line.markedSpans = spans;
	}

	// Helpers used when computing which overlapping collapsed span
	// counts as the larger one.
	function extraLeft(marker) { return marker.inclusiveLeft ? -1 : 0 }
	function extraRight(marker) { return marker.inclusiveRight ? 1 : 0 }

	// Returns a number indicating which of two overlapping collapsed
	// spans is larger (and thus includes the other). Falls back to
	// comparing ids when the spans cover exactly the same range.
	function compareCollapsedMarkers(a, b) {
	  var lenDiff = a.lines.length - b.lines.length;
	  if (lenDiff != 0) { return lenDiff }
	  var aPos = a.find(), bPos = b.find();
	  var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b);
	  if (fromCmp) { return -fromCmp }
	  var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b);
	  if (toCmp) { return toCmp }
	  return b.id - a.id
	}

	// Find out whether a line ends or starts in a collapsed span. If
	// so, return the marker for that span.
	function collapsedSpanAtSide(line, start) {
	  var sps = sawCollapsedSpans && line.markedSpans, found;
	  if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {
	    sp = sps[i];
	    if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&
	        (!found || compareCollapsedMarkers(found, sp.marker) < 0))
	      { found = sp.marker; }
	  } }
	  return found
	}
	function collapsedSpanAtStart(line) { return collapsedSpanAtSide(line, true) }
	function collapsedSpanAtEnd(line) { return collapsedSpanAtSide(line, false) }

	// Test whether there exists a collapsed span that partially
	// overlaps (covers the start or end, but not both) of a new span.
	// Such overlap is not allowed.
	function conflictingCollapsedRange(doc, lineNo$$1, from, to, marker) {
	  var line = getLine(doc, lineNo$$1);
	  var sps = sawCollapsedSpans && line.markedSpans;
	  if (sps) { for (var i = 0; i < sps.length; ++i) {
	    var sp = sps[i];
	    if (!sp.marker.collapsed) { continue }
	    var found = sp.marker.find(0);
	    var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker);
	    var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker);
	    if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) { continue }
	    if (fromCmp <= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.to, from) >= 0 : cmp(found.to, from) > 0) ||
	        fromCmp >= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.from, to) <= 0 : cmp(found.from, to) < 0))
	      { return true }
	  } }
	}

	// A visual line is a line as drawn on the screen. Folding, for
	// example, can cause multiple logical lines to appear on the same
	// visual line. This finds the start of the visual line that the
	// given line is part of (usually that is the line itself).
	function visualLine(line) {
	  var merged;
	  while (merged = collapsedSpanAtStart(line))
	    { line = merged.find(-1, true).line; }
	  return line
	}

	function visualLineEnd(line) {
	  var merged;
	  while (merged = collapsedSpanAtEnd(line))
	    { line = merged.find(1, true).line; }
	  return line
	}

	// Returns an array of logical lines that continue the visual line
	// started by the argument, or undefined if there are no such lines.
	function visualLineContinued(line) {
	  var merged, lines;
	  while (merged = collapsedSpanAtEnd(line)) {
	    line = merged.find(1, true).line
	    ;(lines || (lines = [])).push(line);
	  }
	  return lines
	}

	// Get the line number of the start of the visual line that the
	// given line number is part of.
	function visualLineNo(doc, lineN) {
	  var line = getLine(doc, lineN), vis = visualLine(line);
	  if (line == vis) { return lineN }
	  return lineNo(vis)
	}

	// Get the line number of the start of the next visual line after
	// the given line.
	function visualLineEndNo(doc, lineN) {
	  if (lineN > doc.lastLine()) { return lineN }
	  var line = getLine(doc, lineN), merged;
	  if (!lineIsHidden(doc, line)) { return lineN }
	  while (merged = collapsedSpanAtEnd(line))
	    { line = merged.find(1, true).line; }
	  return lineNo(line) + 1
	}

	// Compute whether a line is hidden. Lines count as hidden when they
	// are part of a visual line that starts with another line, or when
	// they are entirely covered by collapsed, non-widget span.
	function lineIsHidden(doc, line) {
	  var sps = sawCollapsedSpans && line.markedSpans;
	  if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {
	    sp = sps[i];
	    if (!sp.marker.collapsed) { continue }
	    if (sp.from == null) { return true }
	    if (sp.marker.widgetNode) { continue }
	    if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp))
	      { return true }
	  } }
	}
	function lineIsHiddenInner(doc, line, span) {
	  if (span.to == null) {
	    var end = span.marker.find(1, true);
	    return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker))
	  }
	  if (span.marker.inclusiveRight && span.to == line.text.length)
	    { return true }
	  for (var sp = (void 0), i = 0; i < line.markedSpans.length; ++i) {
	    sp = line.markedSpans[i];
	    if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to &&
	        (sp.to == null || sp.to != span.from) &&
	        (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
	        lineIsHiddenInner(doc, line, sp)) { return true }
	  }
	}

	// Find the height above the given line.
	function heightAtLine(lineObj) {
	  lineObj = visualLine(lineObj);

	  var h = 0, chunk = lineObj.parent;
	  for (var i = 0; i < chunk.lines.length; ++i) {
	    var line = chunk.lines[i];
	    if (line == lineObj) { break }
	    else { h += line.height; }
	  }
	  for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
	    for (var i$1 = 0; i$1 < p.children.length; ++i$1) {
	      var cur = p.children[i$1];
	      if (cur == chunk) { break }
	      else { h += cur.height; }
	    }
	  }
	  return h
	}

	// Compute the character length of a line, taking into account
	// collapsed ranges (see markText) that might hide parts, and join
	// other lines onto it.
	function lineLength(line) {
	  if (line.height == 0) { return 0 }
	  var len = line.text.length, merged, cur = line;
	  while (merged = collapsedSpanAtStart(cur)) {
	    var found = merged.find(0, true);
	    cur = found.from.line;
	    len += found.from.ch - found.to.ch;
	  }
	  cur = line;
	  while (merged = collapsedSpanAtEnd(cur)) {
	    var found$1 = merged.find(0, true);
	    len -= cur.text.length - found$1.from.ch;
	    cur = found$1.to.line;
	    len += cur.text.length - found$1.to.ch;
	  }
	  return len
	}

	// Find the longest line in the document.
	function findMaxLine(cm) {
	  var d = cm.display, doc = cm.doc;
	  d.maxLine = getLine(doc, doc.first);
	  d.maxLineLength = lineLength(d.maxLine);
	  d.maxLineChanged = true;
	  doc.iter(function (line) {
	    var len = lineLength(line);
	    if (len > d.maxLineLength) {
	      d.maxLineLength = len;
	      d.maxLine = line;
	    }
	  });
	}

	// BIDI HELPERS

	function iterateBidiSections(order, from, to, f) {
	  if (!order) { return f(from, to, "ltr") }
	  var found = false;
	  for (var i = 0; i < order.length; ++i) {
	    var part = order[i];
	    if (part.from < to && part.to > from || from == to && part.to == from) {
	      f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr");
	      found = true;
	    }
	  }
	  if (!found) { f(from, to, "ltr"); }
	}

	var bidiOther = null;
	function getBidiPartAt(order, ch, sticky) {
	  var found;
	  bidiOther = null;
	  for (var i = 0; i < order.length; ++i) {
	    var cur = order[i];
	    if (cur.from < ch && cur.to > ch) { return i }
	    if (cur.to == ch) {
	      if (cur.from != cur.to && sticky == "before") { found = i; }
	      else { bidiOther = i; }
	    }
	    if (cur.from == ch) {
	      if (cur.from != cur.to && sticky != "before") { found = i; }
	      else { bidiOther = i; }
	    }
	  }
	  return found != null ? found : bidiOther
	}

	// Bidirectional ordering algorithm
	// See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
	// that this (partially) implements.

	// One-char codes used for character types:
	// L (L):   Left-to-Right
	// R (R):   Right-to-Left
	// r (AL):  Right-to-Left Arabic
	// 1 (EN):  European Number
	// + (ES):  European Number Separator
	// % (ET):  European Number Terminator
	// n (AN):  Arabic Number
	// , (CS):  Common Number Separator
	// m (NSM): Non-Spacing Mark
	// b (BN):  Boundary Neutral
	// s (B):   Paragraph Separator
	// t (S):   Segment Separator
	// w (WS):  Whitespace
	// N (ON):  Other Neutrals

	// Returns null if characters are ordered as they appear
	// (left-to-right), or an array of sections ({from, to, level}
	// objects) in the order in which they occur visually.
	var bidiOrdering = (function() {
	  // Character types for codepoints 0 to 0xff
	  var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN";
	  // Character types for codepoints 0x600 to 0x6f9
	  var arabicTypes = "nnnnnnNNr%%r,rNNmmmmmmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmmmnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmnNmmmmmmrrmmNmmmmrr1111111111";
	  function charType(code) {
	    if (code <= 0xf7) { return lowTypes.charAt(code) }
	    else if (0x590 <= code && code <= 0x5f4) { return "R" }
	    else if (0x600 <= code && code <= 0x6f9) { return arabicTypes.charAt(code - 0x600) }
	    else if (0x6ee <= code && code <= 0x8ac) { return "r" }
	    else if (0x2000 <= code && code <= 0x200b) { return "w" }
	    else if (code == 0x200c) { return "b" }
	    else { return "L" }
	  }

	  var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;
	  var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/;

	  function BidiSpan(level, from, to) {
	    this.level = level;
	    this.from = from; this.to = to;
	  }

	  return function(str, direction) {
	    var outerType = direction == "ltr" ? "L" : "R";

	    if (str.length == 0 || direction == "ltr" && !bidiRE.test(str)) { return false }
	    var len = str.length, types = [];
	    for (var i = 0; i < len; ++i)
	      { types.push(charType(str.charCodeAt(i))); }

	    // W1. Examine each non-spacing mark (NSM) in the level run, and
	    // change the type of the NSM to the type of the previous
	    // character. If the NSM is at the start of the level run, it will
	    // get the type of sor.
	    for (var i$1 = 0, prev = outerType; i$1 < len; ++i$1) {
	      var type = types[i$1];
	      if (type == "m") { types[i$1] = prev; }
	      else { prev = type; }
	    }

	    // W2. Search backwards from each instance of a European number
	    // until the first strong type (R, L, AL, or sor) is found. If an
	    // AL is found, change the type of the European number to Arabic
	    // number.
	    // W3. Change all ALs to R.
	    for (var i$2 = 0, cur = outerType; i$2 < len; ++i$2) {
	      var type$1 = types[i$2];
	      if (type$1 == "1" && cur == "r") { types[i$2] = "n"; }
	      else if (isStrong.test(type$1)) { cur = type$1; if (type$1 == "r") { types[i$2] = "R"; } }
	    }

	    // W4. A single European separator between two European numbers
	    // changes to a European number. A single common separator between
	    // two numbers of the same type changes to that type.
	    for (var i$3 = 1, prev$1 = types[0]; i$3 < len - 1; ++i$3) {
	      var type$2 = types[i$3];
	      if (type$2 == "+" && prev$1 == "1" && types[i$3+1] == "1") { types[i$3] = "1"; }
	      else if (type$2 == "," && prev$1 == types[i$3+1] &&
	               (prev$1 == "1" || prev$1 == "n")) { types[i$3] = prev$1; }
	      prev$1 = type$2;
	    }

	    // W5. A sequence of European terminators adjacent to European
	    // numbers changes to all European numbers.
	    // W6. Otherwise, separators and terminators change to Other
	    // Neutral.
	    for (var i$4 = 0; i$4 < len; ++i$4) {
	      var type$3 = types[i$4];
	      if (type$3 == ",") { types[i$4] = "N"; }
	      else if (type$3 == "%") {
	        var end = (void 0);
	        for (end = i$4 + 1; end < len && types[end] == "%"; ++end) {}
	        var replace = (i$4 && types[i$4-1] == "!") || (end < len && types[end] == "1") ? "1" : "N";
	        for (var j = i$4; j < end; ++j) { types[j] = replace; }
	        i$4 = end - 1;
	      }
	    }

	    // W7. Search backwards from each instance of a European number
	    // until the first strong type (R, L, or sor) is found. If an L is
	    // found, then change the type of the European number to L.
	    for (var i$5 = 0, cur$1 = outerType; i$5 < len; ++i$5) {
	      var type$4 = types[i$5];
	      if (cur$1 == "L" && type$4 == "1") { types[i$5] = "L"; }
	      else if (isStrong.test(type$4)) { cur$1 = type$4; }
	    }

	    // N1. A sequence of neutrals takes the direction of the
	    // surrounding strong text if the text on both sides has the same
	    // direction. European and Arabic numbers act as if they were R in
	    // terms of their influence on neutrals. Start-of-level-run (sor)
	    // and end-of-level-run (eor) are used at level run boundaries.
	    // N2. Any remaining neutrals take the embedding direction.
	    for (var i$6 = 0; i$6 < len; ++i$6) {
	      if (isNeutral.test(types[i$6])) {
	        var end$1 = (void 0);
	        for (end$1 = i$6 + 1; end$1 < len && isNeutral.test(types[end$1]); ++end$1) {}
	        var before = (i$6 ? types[i$6-1] : outerType) == "L";
	        var after = (end$1 < len ? types[end$1] : outerType) == "L";
	        var replace$1 = before == after ? (before ? "L" : "R") : outerType;
	        for (var j$1 = i$6; j$1 < end$1; ++j$1) { types[j$1] = replace$1; }
	        i$6 = end$1 - 1;
	      }
	    }

	    // Here we depart from the documented algorithm, in order to avoid
	    // building up an actual levels array. Since there are only three
	    // levels (0, 1, 2) in an implementation that doesn't take
	    // explicit embedding into account, we can build up the order on
	    // the fly, without following the level-based algorithm.
	    var order = [], m;
	    for (var i$7 = 0; i$7 < len;) {
	      if (countsAsLeft.test(types[i$7])) {
	        var start = i$7;
	        for (++i$7; i$7 < len && countsAsLeft.test(types[i$7]); ++i$7) {}
	        order.push(new BidiSpan(0, start, i$7));
	      } else {
	        var pos = i$7, at = order.length;
	        for (++i$7; i$7 < len && types[i$7] != "L"; ++i$7) {}
	        for (var j$2 = pos; j$2 < i$7;) {
	          if (countsAsNum.test(types[j$2])) {
	            if (pos < j$2) { order.splice(at, 0, new BidiSpan(1, pos, j$2)); }
	            var nstart = j$2;
	            for (++j$2; j$2 < i$7 && countsAsNum.test(types[j$2]); ++j$2) {}
	            order.splice(at, 0, new BidiSpan(2, nstart, j$2));
	            pos = j$2;
	          } else { ++j$2; }
	        }
	        if (pos < i$7) { order.splice(at, 0, new BidiSpan(1, pos, i$7)); }
	      }
	    }
	    if (order[0].level == 1 && (m = str.match(/^\s+/))) {
	      order[0].from = m[0].length;
	      order.unshift(new BidiSpan(0, 0, m[0].length));
	    }
	    if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
	      lst(order).to -= m[0].length;
	      order.push(new BidiSpan(0, len - m[0].length, len));
	    }

	    return direction == "rtl" ? order.reverse() : order
	  }
	})();

	// Get the bidi ordering for the given line (and cache it). Returns
	// false for lines that are fully left-to-right, and an array of
	// BidiSpan objects otherwise.
	function getOrder(line, direction) {
	  var order = line.order;
	  if (order == null) { order = line.order = bidiOrdering(line.text, direction); }
	  return order
	}

	function moveCharLogically(line, ch, dir) {
	  var target = skipExtendingChars(line.text, ch + dir, dir);
	  return target < 0 || target > line.text.length ? null : target
	}

	function moveLogically(line, start, dir) {
	  var ch = moveCharLogically(line, start.ch, dir);
	  return ch == null ? null : new Pos(start.line, ch, dir < 0 ? "after" : "before")
	}

	function endOfLine(visually, cm, lineObj, lineNo, dir) {
	  if (visually) {
	    var order = getOrder(lineObj, cm.doc.direction);
	    if (order) {
	      var part = dir < 0 ? lst(order) : order[0];
	      var moveInStorageOrder = (dir < 0) == (part.level == 1);
	      var sticky = moveInStorageOrder ? "after" : "before";
	      var ch;
	      // With a wrapped rtl chunk (possibly spanning multiple bidi parts),
	      // it could be that the last bidi part is not on the last visual line,
	      // since visual lines contain content order-consecutive chunks.
	      // Thus, in rtl, we are looking for the first (content-order) character
	      // in the rtl chunk that is on the last line (that is, the same line
	      // as the last (content-order) character).
	      if (part.level > 0) {
	        var prep = prepareMeasureForLine(cm, lineObj);
	        ch = dir < 0 ? lineObj.text.length - 1 : 0;
	        var targetTop = measureCharPrepared(cm, prep, ch).top;
	        ch = findFirst(function (ch) { return measureCharPrepared(cm, prep, ch).top == targetTop; }, (dir < 0) == (part.level == 1) ? part.from : part.to - 1, ch);
	        if (sticky == "before") { ch = moveCharLogically(lineObj, ch, 1); }
	      } else { ch = dir < 0 ? part.to : part.from; }
	      return new Pos(lineNo, ch, sticky)
	    }
	  }
	  return new Pos(lineNo, dir < 0 ? lineObj.text.length : 0, dir < 0 ? "before" : "after")
	}

	function moveVisually(cm, line, start, dir) {
	  var bidi = getOrder(line, cm.doc.direction);
	  if (!bidi) { return moveLogically(line, start, dir) }
	  if (start.ch >= line.text.length) {
	    start.ch = line.text.length;
	    start.sticky = "before";
	  } else if (start.ch <= 0) {
	    start.ch = 0;
	    start.sticky = "after";
	  }
	  var partPos = getBidiPartAt(bidi, start.ch, start.sticky), part = bidi[partPos];
	  if (cm.doc.direction == "ltr" && part.level % 2 == 0 && (dir > 0 ? part.to > start.ch : part.from < start.ch)) {
	    // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines,
	    // nothing interesting happens.
	    return moveLogically(line, start, dir)
	  }

	  var mv = function (pos, dir) { return moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir); };
	  var prep;
	  var getWrappedLineExtent = function (ch) {
	    if (!cm.options.lineWrapping) { return {begin: 0, end: line.text.length} }
	    prep = prep || prepareMeasureForLine(cm, line);
	    return wrappedLineExtentChar(cm, line, prep, ch)
	  };
	  var wrappedLineExtent = getWrappedLineExtent(start.sticky == "before" ? mv(start, -1) : start.ch);

	  if (cm.doc.direction == "rtl" || part.level == 1) {
	    var moveInStorageOrder = (part.level == 1) == (dir < 0);
	    var ch = mv(start, moveInStorageOrder ? 1 : -1);
	    if (ch != null && (!moveInStorageOrder ? ch >= part.from && ch >= wrappedLineExtent.begin : ch <= part.to && ch <= wrappedLineExtent.end)) {
	      // Case 2: We move within an rtl part or in an rtl editor on the same visual line
	      var sticky = moveInStorageOrder ? "before" : "after";
	      return new Pos(start.line, ch, sticky)
	    }
	  }

	  // Case 3: Could not move within this bidi part in this visual line, so leave
	  // the current bidi part

	  var searchInVisualLine = function (partPos, dir, wrappedLineExtent) {
	    var getRes = function (ch, moveInStorageOrder) { return moveInStorageOrder
	      ? new Pos(start.line, mv(ch, 1), "before")
	      : new Pos(start.line, ch, "after"); };

	    for (; partPos >= 0 && partPos < bidi.length; partPos += dir) {
	      var part = bidi[partPos];
	      var moveInStorageOrder = (dir > 0) == (part.level != 1);
	      var ch = moveInStorageOrder ? wrappedLineExtent.begin : mv(wrappedLineExtent.end, -1);
	      if (part.from <= ch && ch < part.to) { return getRes(ch, moveInStorageOrder) }
	      ch = moveInStorageOrder ? part.from : mv(part.to, -1);
	      if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) { return getRes(ch, moveInStorageOrder) }
	    }
	  };

	  // Case 3a: Look for other bidi parts on the same visual line
	  var res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent);
	  if (res) { return res }

	  // Case 3b: Look for other bidi parts on the next visual line
	  var nextCh = dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1);
	  if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) {
	    res = searchInVisualLine(dir > 0 ? 0 : bidi.length - 1, dir, getWrappedLineExtent(nextCh));
	    if (res) { return res }
	  }

	  // Case 4: Nowhere to move
	  return null
	}

	// EVENT HANDLING

	// Lightweight event framework. on/off also work on DOM nodes,
	// registering native DOM handlers.

	var noHandlers = [];

	var on = function(emitter, type, f) {
	  if (emitter.addEventListener) {
	    emitter.addEventListener(type, f, false);
	  } else if (emitter.attachEvent) {
	    emitter.attachEvent("on" + type, f);
	  } else {
	    var map$$1 = emitter._handlers || (emitter._handlers = {});
	    map$$1[type] = (map$$1[type] || noHandlers).concat(f);
	  }
	};

	function getHandlers(emitter, type) {
	  return emitter._handlers && emitter._handlers[type] || noHandlers
	}

	function off(emitter, type, f) {
	  if (emitter.removeEventListener) {
	    emitter.removeEventListener(type, f, false);
	  } else if (emitter.detachEvent) {
	    emitter.detachEvent("on" + type, f);
	  } else {
	    var map$$1 = emitter._handlers, arr = map$$1 && map$$1[type];
	    if (arr) {
	      var index = indexOf(arr, f);
	      if (index > -1)
	        { map$$1[type] = arr.slice(0, index).concat(arr.slice(index + 1)); }
	    }
	  }
	}

	function signal(emitter, type /*, values...*/) {
	  var handlers = getHandlers(emitter, type);
	  if (!handlers.length) { return }
	  var args = Array.prototype.slice.call(arguments, 2);
	  for (var i = 0; i < handlers.length; ++i) { handlers[i].apply(null, args); }
	}

	// The DOM events that CodeMirror handles can be overridden by
	// registering a (non-DOM) handler on the editor for the event name,
	// and preventDefault-ing the event in that handler.
	function signalDOMEvent(cm, e, override) {
	  if (typeof e == "string")
	    { e = {type: e, preventDefault: function() { this.defaultPrevented = true; }}; }
	  signal(cm, override || e.type, cm, e);
	  return e_defaultPrevented(e) || e.codemirrorIgnore
	}

	function signalCursorActivity(cm) {
	  var arr = cm._handlers && cm._handlers.cursorActivity;
	  if (!arr) { return }
	  var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = []);
	  for (var i = 0; i < arr.length; ++i) { if (indexOf(set, arr[i]) == -1)
	    { set.push(arr[i]); } }
	}

	function hasHandler(emitter, type) {
	  return getHandlers(emitter, type).length > 0
	}

	// Add on and off methods to a constructor's prototype, to make
	// registering events on such objects more convenient.
	function eventMixin(ctor) {
	  ctor.prototype.on = function(type, f) {on(this, type, f);};
	  ctor.prototype.off = function(type, f) {off(this, type, f);};
	}

	// Due to the fact that we still support jurassic IE versions, some
	// compatibility wrappers are needed.

	function e_preventDefault(e) {
	  if (e.preventDefault) { e.preventDefault(); }
	  else { e.returnValue = false; }
	}
	function e_stopPropagation(e) {
	  if (e.stopPropagation) { e.stopPropagation(); }
	  else { e.cancelBubble = true; }
	}
	function e_defaultPrevented(e) {
	  return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false
	}
	function e_stop(e) {e_preventDefault(e); e_stopPropagation(e);}

	function e_target(e) {return e.target || e.srcElement}
	function e_button(e) {
	  var b = e.which;
	  if (b == null) {
	    if (e.button & 1) { b = 1; }
	    else if (e.button & 2) { b = 3; }
	    else if (e.button & 4) { b = 2; }
	  }
	  if (mac && e.ctrlKey && b == 1) { b = 3; }
	  return b
	}

	// Detect drag-and-drop
	var dragAndDrop = function() {
	  // There is *some* kind of drag-and-drop support in IE6-8, but I
	  // couldn't get it to work yet.
	  if (ie && ie_version < 9) { return false }
	  var div = elt('div');
	  return "draggable" in div || "dragDrop" in div
	}();

	var zwspSupported;
	function zeroWidthElement(measure) {
	  if (zwspSupported == null) {
	    var test = elt("span", "\u200b");
	    removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));
	    if (measure.firstChild.offsetHeight != 0)
	      { zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8); }
	  }
	  var node = zwspSupported ? elt("span", "\u200b") :
	    elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
	  node.setAttribute("cm-text", "");
	  return node
	}

	// Feature-detect IE's crummy client rect reporting for bidi text
	var badBidiRects;
	function hasBadBidiRects(measure) {
	  if (badBidiRects != null) { return badBidiRects }
	  var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"));
	  var r0 = range(txt, 0, 1).getBoundingClientRect();
	  var r1 = range(txt, 1, 2).getBoundingClientRect();
	  removeChildren(measure);
	  if (!r0 || r0.left == r0.right) { return false } // Safari returns null in some cases (#2780)
	  return badBidiRects = (r1.right - r0.right < 3)
	}

	// See if "".split is the broken IE version, if so, provide an
	// alternative way to split lines.
	var splitLinesAuto = "\n\nb".split(/\n/).length != 3 ? function (string) {
	  var pos = 0, result = [], l = string.length;
	  while (pos <= l) {
	    var nl = string.indexOf("\n", pos);
	    if (nl == -1) { nl = string.length; }
	    var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);
	    var rt = line.indexOf("\r");
	    if (rt != -1) {
	      result.push(line.slice(0, rt));
	      pos += rt + 1;
	    } else {
	      result.push(line);
	      pos = nl + 1;
	    }
	  }
	  return result
	} : function (string) { return string.split(/\r\n?|\n/); };

	var hasSelection = window.getSelection ? function (te) {
	  try { return te.selectionStart != te.selectionEnd }
	  catch(e) { return false }
	} : function (te) {
	  var range$$1;
	  try {range$$1 = te.ownerDocument.selection.createRange();}
	  catch(e) {}
	  if (!range$$1 || range$$1.parentElement() != te) { return false }
	  return range$$1.compareEndPoints("StartToEnd", range$$1) != 0
	};

	var hasCopyEvent = (function () {
	  var e = elt("div");
	  if ("oncopy" in e) { return true }
	  e.setAttribute("oncopy", "return;");
	  return typeof e.oncopy == "function"
	})();

	var badZoomedRects = null;
	function hasBadZoomedRects(measure) {
	  if (badZoomedRects != null) { return badZoomedRects }
	  var node = removeChildrenAndAdd(measure, elt("span", "x"));
	  var normal = node.getBoundingClientRect();
	  var fromRange = range(node, 0, 1).getBoundingClientRect();
	  return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1
	}

	// Known modes, by name and by MIME
	var modes = {};
	var mimeModes = {};

	// Extra arguments are stored as the mode's dependencies, which is
	// used by (legacy) mechanisms like loadmode.js to automatically
	// load a mode. (Preferred mechanism is the require/define calls.)
	function defineMode(name, mode) {
	  if (arguments.length > 2)
	    { mode.dependencies = Array.prototype.slice.call(arguments, 2); }
	  modes[name] = mode;
	}

	function defineMIME(mime, spec) {
	  mimeModes[mime] = spec;
	}

	// Given a MIME type, a {name, ...options} config object, or a name
	// string, return a mode config object.
	function resolveMode(spec) {
	  if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
	    spec = mimeModes[spec];
	  } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
	    var found = mimeModes[spec.name];
	    if (typeof found == "string") { found = {name: found}; }
	    spec = createObj(found, spec);
	    spec.name = found.name;
	  } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
	    return resolveMode("application/xml")
	  } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+json$/.test(spec)) {
	    return resolveMode("application/json")
	  }
	  if (typeof spec == "string") { return {name: spec} }
	  else { return spec || {name: "null"} }
	}

	// Given a mode spec (anything that resolveMode accepts), find and
	// initialize an actual mode object.
	function getMode(options, spec) {
	  spec = resolveMode(spec);
	  var mfactory = modes[spec.name];
	  if (!mfactory) { return getMode(options, "text/plain") }
	  var modeObj = mfactory(options, spec);
	  if (modeExtensions.hasOwnProperty(spec.name)) {
	    var exts = modeExtensions[spec.name];
	    for (var prop in exts) {
	      if (!exts.hasOwnProperty(prop)) { continue }
	      if (modeObj.hasOwnProperty(prop)) { modeObj["_" + prop] = modeObj[prop]; }
	      modeObj[prop] = exts[prop];
	    }
	  }
	  modeObj.name = spec.name;
	  if (spec.helperType) { modeObj.helperType = spec.helperType; }
	  if (spec.modeProps) { for (var prop$1 in spec.modeProps)
	    { modeObj[prop$1] = spec.modeProps[prop$1]; } }

	  return modeObj
	}

	// This can be used to attach properties to mode objects from
	// outside the actual mode definition.
	var modeExtensions = {};
	function extendMode(mode, properties) {
	  var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});
	  copyObj(properties, exts);
	}

	function copyState(mode, state) {
	  if (state === true) { return state }
	  if (mode.copyState) { return mode.copyState(state) }
	  var nstate = {};
	  for (var n in state) {
	    var val = state[n];
	    if (val instanceof Array) { val = val.concat([]); }
	    nstate[n] = val;
	  }
	  return nstate
	}

	// Given a mode and a state (for that mode), find the inner mode and
	// state at the position that the state refers to.
	function innerMode(mode, state) {
	  var info;
	  while (mode.innerMode) {
	    info = mode.innerMode(state);
	    if (!info || info.mode == mode) { break }
	    state = info.state;
	    mode = info.mode;
	  }
	  return info || {mode: mode, state: state}
	}

	function startState(mode, a1, a2) {
	  return mode.startState ? mode.startState(a1, a2) : true
	}

	// STRING STREAM

	// Fed to the mode parsers, provides helper functions to make
	// parsers more succinct.

	var StringStream = function(string, tabSize, lineOracle) {
	  this.pos = this.start = 0;
	  this.string = string;
	  this.tabSize = tabSize || 8;
	  this.lastColumnPos = this.lastColumnValue = 0;
	  this.lineStart = 0;
	  this.lineOracle = lineOracle;
	};

	StringStream.prototype.eol = function () {return this.pos >= this.string.length};
	StringStream.prototype.sol = function () {return this.pos == this.lineStart};
	StringStream.prototype.peek = function () {return this.string.charAt(this.pos) || undefined};
	StringStream.prototype.next = function () {
	  if (this.pos < this.string.length)
	    { return this.string.charAt(this.pos++) }
	};
	StringStream.prototype.eat = function (match) {
	  var ch = this.string.charAt(this.pos);
	  var ok;
	  if (typeof match == "string") { ok = ch == match; }
	  else { ok = ch && (match.test ? match.test(ch) : match(ch)); }
	  if (ok) {++this.pos; return ch}
	};
	StringStream.prototype.eatWhile = function (match) {
	  var start = this.pos;
	  while (this.eat(match)){}
	  return this.pos > start
	};
	StringStream.prototype.eatSpace = function () {
	    var this$1 = this;

	  var start = this.pos;
	  while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) { ++this$1.pos; }
	  return this.pos > start
	};
	StringStream.prototype.skipToEnd = function () {this.pos = this.string.length;};
	StringStream.prototype.skipTo = function (ch) {
	  var found = this.string.indexOf(ch, this.pos);
	  if (found > -1) {this.pos = found; return true}
	};
	StringStream.prototype.backUp = function (n) {this.pos -= n;};
	StringStream.prototype.column = function () {
	  if (this.lastColumnPos < this.start) {
	    this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);
	    this.lastColumnPos = this.start;
	  }
	  return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
	};
	StringStream.prototype.indentation = function () {
	  return countColumn(this.string, null, this.tabSize) -
	    (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
	};
	StringStream.prototype.match = function (pattern, consume, caseInsensitive) {
	  if (typeof pattern == "string") {
	    var cased = function (str) { return caseInsensitive ? str.toLowerCase() : str; };
	    var substr = this.string.substr(this.pos, pattern.length);
	    if (cased(substr) == cased(pattern)) {
	      if (consume !== false) { this.pos += pattern.length; }
	      return true
	    }
	  } else {
	    var match = this.string.slice(this.pos).match(pattern);
	    if (match && match.index > 0) { return null }
	    if (match && consume !== false) { this.pos += match[0].length; }
	    return match
	  }
	};
	StringStream.prototype.current = function (){return this.string.slice(this.start, this.pos)};
	StringStream.prototype.hideFirstChars = function (n, inner) {
	  this.lineStart += n;
	  try { return inner() }
	  finally { this.lineStart -= n; }
	};
	StringStream.prototype.lookAhead = function (n) {
	  var oracle = this.lineOracle;
	  return oracle && oracle.lookAhead(n)
	};

	var SavedContext = function(state, lookAhead) {
	  this.state = state;
	  this.lookAhead = lookAhead;
	};

	var Context = function(doc, state, line, lookAhead) {
	  this.state = state;
	  this.doc = doc;
	  this.line = line;
	  this.maxLookAhead = lookAhead || 0;
	};

	Context.prototype.lookAhead = function (n) {
	  var line = this.doc.getLine(this.line + n);
	  if (line != null && n > this.maxLookAhead) { this.maxLookAhead = n; }
	  return line
	};

	Context.prototype.nextLine = function () {
	  this.line++;
	  if (this.maxLookAhead > 0) { this.maxLookAhead--; }
	};

	Context.fromSaved = function (doc, saved, line) {
	  if (saved instanceof SavedContext)
	    { return new Context(doc, copyState(doc.mode, saved.state), line, saved.lookAhead) }
	  else
	    { return new Context(doc, copyState(doc.mode, saved), line) }
	};

	Context.prototype.save = function (copy) {
	  var state = copy !== false ? copyState(this.doc.mode, this.state) : this.state;
	  return this.maxLookAhead > 0 ? new SavedContext(state, this.maxLookAhead) : state
	};


	// Compute a style array (an array starting with a mode generation
	// -- for invalidation -- followed by pairs of end positions and
	// style strings), which is used to highlight the tokens on the
	// line.
	function highlightLine(cm, line, context, forceToEnd) {
	  // A styles array always starts with a number identifying the
	  // mode/overlays that it is based on (for easy invalidation).
	  var st = [cm.state.modeGen], lineClasses = {};
	  // Compute the base array of styles
	  runMode(cm, line.text, cm.doc.mode, context, function (end, style) { return st.push(end, style); },
	          lineClasses, forceToEnd);
	  var state = context.state;

	  // Run overlays, adjust style array.
	  var loop = function ( o ) {
	    var overlay = cm.state.overlays[o], i = 1, at = 0;
	    context.state = true;
	    runMode(cm, line.text, overlay.mode, context, function (end, style) {
	      var start = i;
	      // Ensure there's a token end at the current position, and that i points at it
	      while (at < end) {
	        var i_end = st[i];
	        if (i_end > end)
	          { st.splice(i, 1, end, st[i+1], i_end); }
	        i += 2;
	        at = Math.min(end, i_end);
	      }
	      if (!style) { return }
	      if (overlay.opaque) {
	        st.splice(start, i - start, end, "overlay " + style);
	        i = start + 2;
	      } else {
	        for (; start < i; start += 2) {
	          var cur = st[start+1];
	          st[start+1] = (cur ? cur + " " : "") + "overlay " + style;
	        }
	      }
	    }, lineClasses);
	  };

	  for (var o = 0; o < cm.state.overlays.length; ++o) loop( o );
	  context.state = state;

	  return {styles: st, classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null}
	}

	function getLineStyles(cm, line, updateFrontier) {
	  if (!line.styles || line.styles[0] != cm.state.modeGen) {
	    var context = getContextBefore(cm, lineNo(line));
	    var resetState = line.text.length > cm.options.maxHighlightLength && copyState(cm.doc.mode, context.state);
	    var result = highlightLine(cm, line, context);
	    if (resetState) { context.state = resetState; }
	    line.stateAfter = context.save(!resetState);
	    line.styles = result.styles;
	    if (result.classes) { line.styleClasses = result.classes; }
	    else if (line.styleClasses) { line.styleClasses = null; }
	    if (updateFrontier === cm.doc.highlightFrontier)
	      { cm.doc.modeFrontier = Math.max(cm.doc.modeFrontier, ++cm.doc.highlightFrontier); }
	  }
	  return line.styles
	}

	function getContextBefore(cm, n, precise) {
	  var doc = cm.doc, display = cm.display;
	  if (!doc.mode.startState) { return new Context(doc, true, n) }
	  var start = findStartLine(cm, n, precise);
	  var saved = start > doc.first && getLine(doc, start - 1).stateAfter;
	  var context = saved ? Context.fromSaved(doc, saved, start) : new Context(doc, startState(doc.mode), start);

	  doc.iter(start, n, function (line) {
	    processLine(cm, line.text, context);
	    var pos = context.line;
	    line.stateAfter = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo ? context.save() : null;
	    context.nextLine();
	  });
	  if (precise) { doc.modeFrontier = context.line; }
	  return context
	}

	// Lightweight form of highlight -- proceed over this line and
	// update state, but don't save a style array. Used for lines that
	// aren't currently visible.
	function processLine(cm, text, context, startAt) {
	  var mode = cm.doc.mode;
	  var stream = new StringStream(text, cm.options.tabSize, context);
	  stream.start = stream.pos = startAt || 0;
	  if (text == "") { callBlankLine(mode, context.state); }
	  while (!stream.eol()) {
	    readToken(mode, stream, context.state);
	    stream.start = stream.pos;
	  }
	}

	function callBlankLine(mode, state) {
	  if (mode.blankLine) { return mode.blankLine(state) }
	  if (!mode.innerMode) { return }
	  var inner = innerMode(mode, state);
	  if (inner.mode.blankLine) { return inner.mode.blankLine(inner.state) }
	}

	function readToken(mode, stream, state, inner) {
	  for (var i = 0; i < 10; i++) {
	    if (inner) { inner[0] = innerMode(mode, state).mode; }
	    var style = mode.token(stream, state);
	    if (stream.pos > stream.start) { return style }
	  }
	  throw new Error("Mode " + mode.name + " failed to advance stream.")
	}

	var Token = function(stream, type, state) {
	  this.start = stream.start; this.end = stream.pos;
	  this.string = stream.current();
	  this.type = type || null;
	  this.state = state;
	};

	// Utility for getTokenAt and getLineTokens
	function takeToken(cm, pos, precise, asArray) {
	  var doc = cm.doc, mode = doc.mode, style;
	  pos = clipPos(doc, pos);
	  var line = getLine(doc, pos.line), context = getContextBefore(cm, pos.line, precise);
	  var stream = new StringStream(line.text, cm.options.tabSize, context), tokens;
	  if (asArray) { tokens = []; }
	  while ((asArray || stream.pos < pos.ch) && !stream.eol()) {
	    stream.start = stream.pos;
	    style = readToken(mode, stream, context.state);
	    if (asArray) { tokens.push(new Token(stream, style, copyState(doc.mode, context.state))); }
	  }
	  return asArray ? tokens : new Token(stream, style, context.state)
	}

	function extractLineClasses(type, output) {
	  if (type) { for (;;) {
	    var lineClass = type.match(/(?:^|\s+)line-(background-)?(\S+)/);
	    if (!lineClass) { break }
	    type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length);
	    var prop = lineClass[1] ? "bgClass" : "textClass";
	    if (output[prop] == null)
	      { output[prop] = lineClass[2]; }
	    else if (!(new RegExp("(?:^|\s)" + lineClass[2] + "(?:$|\s)")).test(output[prop]))
	      { output[prop] += " " + lineClass[2]; }
	  } }
	  return type
	}

	// Run the given mode's parser over a line, calling f for each token.
	function runMode(cm, text, mode, context, f, lineClasses, forceToEnd) {
	  var flattenSpans = mode.flattenSpans;
	  if (flattenSpans == null) { flattenSpans = cm.options.flattenSpans; }
	  var curStart = 0, curStyle = null;
	  var stream = new StringStream(text, cm.options.tabSize, context), style;
	  var inner = cm.options.addModeClass && [null];
	  if (text == "") { extractLineClasses(callBlankLine(mode, context.state), lineClasses); }
	  while (!stream.eol()) {
	    if (stream.pos > cm.options.maxHighlightLength) {
	      flattenSpans = false;
	      if (forceToEnd) { processLine(cm, text, context, stream.pos); }
	      stream.pos = text.length;
	      style = null;
	    } else {
	      style = extractLineClasses(readToken(mode, stream, context.state, inner), lineClasses);
	    }
	    if (inner) {
	      var mName = inner[0].name;
	      if (mName) { style = "m-" + (style ? mName + " " + style : mName); }
	    }
	    if (!flattenSpans || curStyle != style) {
	      while (curStart < stream.start) {
	        curStart = Math.min(stream.start, curStart + 5000);
	        f(curStart, curStyle);
	      }
	      curStyle = style;
	    }
	    stream.start = stream.pos;
	  }
	  while (curStart < stream.pos) {
	    // Webkit seems to refuse to render text nodes longer than 57444
	    // characters, and returns inaccurate measurements in nodes
	    // starting around 5000 chars.
	    var pos = Math.min(stream.pos, curStart + 5000);
	    f(pos, curStyle);
	    curStart = pos;
	  }
	}

	// Finds the line to start with when starting a parse. Tries to
	// find a line with a stateAfter, so that it can start with a
	// valid state. If that fails, it returns the line with the
	// smallest indentation, which tends to need the least context to
	// parse correctly.
	function findStartLine(cm, n, precise) {
	  var minindent, minline, doc = cm.doc;
	  var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100);
	  for (var search = n; search > lim; --search) {
	    if (search <= doc.first) { return doc.first }
	    var line = getLine(doc, search - 1), after = line.stateAfter;
	    if (after && (!precise || search + (after instanceof SavedContext ? after.lookAhead : 0) <= doc.modeFrontier))
	      { return search }
	    var indented = countColumn(line.text, null, cm.options.tabSize);
	    if (minline == null || minindent > indented) {
	      minline = search - 1;
	      minindent = indented;
	    }
	  }
	  return minline
	}

	function retreatFrontier(doc, n) {
	  doc.modeFrontier = Math.min(doc.modeFrontier, n);
	  if (doc.highlightFrontier < n - 10) { return }
	  var start = doc.first;
	  for (var line = n - 1; line > start; line--) {
	    var saved = getLine(doc, line).stateAfter;
	    // change is on 3
	    // state on line 1 looked ahead 2 -- so saw 3
	    // test 1 + 2 < 3 should cover this
	    if (saved && (!(saved instanceof SavedContext) || line + saved.lookAhead < n)) {
	      start = line + 1;
	      break
	    }
	  }
	  doc.highlightFrontier = Math.min(doc.highlightFrontier, start);
	}

	// LINE DATA STRUCTURE

	// Line objects. These hold state related to a line, including
	// highlighting info (the styles array).
	var Line = function(text, markedSpans, estimateHeight) {
	  this.text = text;
	  attachMarkedSpans(this, markedSpans);
	  this.height = estimateHeight ? estimateHeight(this) : 1;
	};

	Line.prototype.lineNo = function () { return lineNo(this) };
	eventMixin(Line);

	// Change the content (text, markers) of a line. Automatically
	// invalidates cached information and tries to re-estimate the
	// line's height.
	function updateLine(line, text, markedSpans, estimateHeight) {
	  line.text = text;
	  if (line.stateAfter) { line.stateAfter = null; }
	  if (line.styles) { line.styles = null; }
	  if (line.order != null) { line.order = null; }
	  detachMarkedSpans(line);
	  attachMarkedSpans(line, markedSpans);
	  var estHeight = estimateHeight ? estimateHeight(line) : 1;
	  if (estHeight != line.height) { updateLineHeight(line, estHeight); }
	}

	// Detach a line from the document tree and its markers.
	function cleanUpLine(line) {
	  line.parent = null;
	  detachMarkedSpans(line);
	}

	// Convert a style as returned by a mode (either null, or a string
	// containing one or more styles) to a CSS style. This is cached,
	// and also looks for line-wide styles.
	var styleToClassCache = {};
	var styleToClassCacheWithMode = {};
	function interpretTokenStyle(style, options) {
	  if (!style || /^\s*$/.test(style)) { return null }
	  var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache;
	  return cache[style] ||
	    (cache[style] = style.replace(/\S+/g, "cm-$&"))
	}

	// Render the DOM representation of the text of a line. Also builds
	// up a 'line map', which points at the DOM nodes that represent
	// specific stretches of text, and is used by the measuring code.
	// The returned object contains the DOM node, this map, and
	// information about line-wide styles that were set by the mode.
	function buildLineContent(cm, lineView) {
	  // The padding-right forces the element to have a 'border', which
	  // is needed on Webkit to be able to get line-level bounding
	  // rectangles for it (in measureChar).
	  var content = eltP("span", null, null, webkit ? "padding-right: .1px" : null);
	  var builder = {pre: eltP("pre", [content], "CodeMirror-line"), content: content,
	                 col: 0, pos: 0, cm: cm,
	                 trailingSpace: false,
	                 splitSpaces: (ie || webkit) && cm.getOption("lineWrapping")};
	  lineView.measure = {};

	  // Iterate over the logical lines that make up this visual line.
	  for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {
	    var line = i ? lineView.rest[i - 1] : lineView.line, order = (void 0);
	    builder.pos = 0;
	    builder.addToken = buildToken;
	    // Optionally wire in some hacks into the token-rendering
	    // algorithm, to deal with browser quirks.
	    if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line, cm.doc.direction)))
	      { builder.addToken = buildTokenBadBidi(builder.addToken, order); }
	    builder.map = [];
	    var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line);
	    insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate));
	    if (line.styleClasses) {
	      if (line.styleClasses.bgClass)
	        { builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || ""); }
	      if (line.styleClasses.textClass)
	        { builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || ""); }
	    }

	    // Ensure at least a single node is present, for measuring.
	    if (builder.map.length == 0)
	      { builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure))); }

	    // Store the map and a cache object for the current logical line
	    if (i == 0) {
	      lineView.measure.map = builder.map;
	      lineView.measure.cache = {};
	    } else {
	      (lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map)
	      ;(lineView.measure.caches || (lineView.measure.caches = [])).push({});
	    }
	  }

	  // See issue #2901
	  if (webkit) {
	    var last = builder.content.lastChild;
	    if (/\bcm-tab\b/.test(last.className) || (last.querySelector && last.querySelector(".cm-tab")))
	      { builder.content.className = "cm-tab-wrap-hack"; }
	  }

	  signal(cm, "renderLine", cm, lineView.line, builder.pre);
	  if (builder.pre.className)
	    { builder.textClass = joinClasses(builder.pre.className, builder.textClass || ""); }

	  return builder
	}

	function defaultSpecialCharPlaceholder(ch) {
	  var token = elt("span", "\u2022", "cm-invalidchar");
	  token.title = "\\u" + ch.charCodeAt(0).toString(16);
	  token.setAttribute("aria-label", token.title);
	  return token
	}

	// Build up the DOM representation for a single token, and add it to
	// the line map. Takes care to render special characters separately.
	function buildToken(builder, text, style, startStyle, endStyle, title, css) {
	  if (!text) { return }
	  var displayText = builder.splitSpaces ? splitSpaces(text, builder.trailingSpace) : text;
	  var special = builder.cm.state.specialChars, mustWrap = false;
	  var content;
	  if (!special.test(text)) {
	    builder.col += text.length;
	    content = document.createTextNode(displayText);
	    builder.map.push(builder.pos, builder.pos + text.length, content);
	    if (ie && ie_version < 9) { mustWrap = true; }
	    builder.pos += text.length;
	  } else {
	    content = document.createDocumentFragment();
	    var pos = 0;
	    while (true) {
	      special.lastIndex = pos;
	      var m = special.exec(text);
	      var skipped = m ? m.index - pos : text.length - pos;
	      if (skipped) {
	        var txt = document.createTextNode(displayText.slice(pos, pos + skipped));
	        if (ie && ie_version < 9) { content.appendChild(elt("span", [txt])); }
	        else { content.appendChild(txt); }
	        builder.map.push(builder.pos, builder.pos + skipped, txt);
	        builder.col += skipped;
	        builder.pos += skipped;
	      }
	      if (!m) { break }
	      pos += skipped + 1;
	      var txt$1 = (void 0);
	      if (m[0] == "\t") {
	        var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;
	        txt$1 = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
	        txt$1.setAttribute("role", "presentation");
	        txt$1.setAttribute("cm-text", "\t");
	        builder.col += tabWidth;
	      } else if (m[0] == "\r" || m[0] == "\n") {
	        txt$1 = content.appendChild(elt("span", m[0] == "\r" ? "\u240d" : "\u2424", "cm-invalidchar"));
	        txt$1.setAttribute("cm-text", m[0]);
	        builder.col += 1;
	      } else {
	        txt$1 = builder.cm.options.specialCharPlaceholder(m[0]);
	        txt$1.setAttribute("cm-text", m[0]);
	        if (ie && ie_version < 9) { content.appendChild(elt("span", [txt$1])); }
	        else { content.appendChild(txt$1); }
	        builder.col += 1;
	      }
	      builder.map.push(builder.pos, builder.pos + 1, txt$1);
	      builder.pos++;
	    }
	  }
	  builder.trailingSpace = displayText.charCodeAt(text.length - 1) == 32;
	  if (style || startStyle || endStyle || mustWrap || css) {
	    var fullStyle = style || "";
	    if (startStyle) { fullStyle += startStyle; }
	    if (endStyle) { fullStyle += endStyle; }
	    var token = elt("span", [content], fullStyle, css);
	    if (title) { token.title = title; }
	    return builder.content.appendChild(token)
	  }
	  builder.content.appendChild(content);
	}

	function splitSpaces(text, trailingBefore) {
	  if (text.length > 1 && !/  /.test(text)) { return text }
	  var spaceBefore = trailingBefore, result = "";
	  for (var i = 0; i < text.length; i++) {
	    var ch = text.charAt(i);
	    if (ch == " " && spaceBefore && (i == text.length - 1 || text.charCodeAt(i + 1) == 32))
	      { ch = "\u00a0"; }
	    result += ch;
	    spaceBefore = ch == " ";
	  }
	  return result
	}

	// Work around nonsense dimensions being reported for stretches of
	// right-to-left text.
	function buildTokenBadBidi(inner, order) {
	  return function (builder, text, style, startStyle, endStyle, title, css) {
	    style = style ? style + " cm-force-border" : "cm-force-border";
	    var start = builder.pos, end = start + text.length;
	    for (;;) {
	      // Find the part that overlaps with the start of this text
	      var part = (void 0);
	      for (var i = 0; i < order.length; i++) {
	        part = order[i];
	        if (part.to > start && part.from <= start) { break }
	      }
	      if (part.to >= end) { return inner(builder, text, style, startStyle, endStyle, title, css) }
	      inner(builder, text.slice(0, part.to - start), style, startStyle, null, title, css);
	      startStyle = null;
	      text = text.slice(part.to - start);
	      start = part.to;
	    }
	  }
	}

	function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
	  var widget = !ignoreWidget && marker.widgetNode;
	  if (widget) { builder.map.push(builder.pos, builder.pos + size, widget); }
	  if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {
	    if (!widget)
	      { widget = builder.content.appendChild(document.createElement("span")); }
	    widget.setAttribute("cm-marker", marker.id);
	  }
	  if (widget) {
	    builder.cm.display.input.setUneditable(widget);
	    builder.content.appendChild(widget);
	  }
	  builder.pos += size;
	  builder.trailingSpace = false;
	}

	// Outputs a number of spans to make up a line, taking highlighting
	// and marked text into account.
	function insertLineContent(line, builder, styles) {
	  var spans = line.markedSpans, allText = line.text, at = 0;
	  if (!spans) {
	    for (var i$1 = 1; i$1 < styles.length; i$1+=2)
	      { builder.addToken(builder, allText.slice(at, at = styles[i$1]), interpretTokenStyle(styles[i$1+1], builder.cm.options)); }
	    return
	  }

	  var len = allText.length, pos = 0, i = 1, text = "", style, css;
	  var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, title, collapsed;
	  for (;;) {
	    if (nextChange == pos) { // Update current marker set
	      spanStyle = spanEndStyle = spanStartStyle = title = css = "";
	      collapsed = null; nextChange = Infinity;
	      var foundBookmarks = [], endStyles = (void 0);
	      for (var j = 0; j < spans.length; ++j) {
	        var sp = spans[j], m = sp.marker;
	        if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {
	          foundBookmarks.push(m);
	        } else if (sp.from <= pos && (sp.to == null || sp.to > pos || m.collapsed && sp.to == pos && sp.from == pos)) {
	          if (sp.to != null && sp.to != pos && nextChange > sp.to) {
	            nextChange = sp.to;
	            spanEndStyle = "";
	          }
	          if (m.className) { spanStyle += " " + m.className; }
	          if (m.css) { css = (css ? css + ";" : "") + m.css; }
	          if (m.startStyle && sp.from == pos) { spanStartStyle += " " + m.startStyle; }
	          if (m.endStyle && sp.to == nextChange) { (endStyles || (endStyles = [])).push(m.endStyle, sp.to); }
	          if (m.title && !title) { title = m.title; }
	          if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0))
	            { collapsed = sp; }
	        } else if (sp.from > pos && nextChange > sp.from) {
	          nextChange = sp.from;
	        }
	      }
	      if (endStyles) { for (var j$1 = 0; j$1 < endStyles.length; j$1 += 2)
	        { if (endStyles[j$1 + 1] == nextChange) { spanEndStyle += " " + endStyles[j$1]; } } }

	      if (!collapsed || collapsed.from == pos) { for (var j$2 = 0; j$2 < foundBookmarks.length; ++j$2)
	        { buildCollapsedSpan(builder, 0, foundBookmarks[j$2]); } }
	      if (collapsed && (collapsed.from || 0) == pos) {
	        buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,
	                           collapsed.marker, collapsed.from == null);
	        if (collapsed.to == null) { return }
	        if (collapsed.to == pos) { collapsed = false; }
	      }
	    }
	    if (pos >= len) { break }

	    var upto = Math.min(len, nextChange);
	    while (true) {
	      if (text) {
	        var end = pos + text.length;
	        if (!collapsed) {
	          var tokenText = end > upto ? text.slice(0, upto - pos) : text;
	          builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
	                           spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", title, css);
	        }
	        if (end >= upto) {text = text.slice(upto - pos); pos = upto; break}
	        pos = end;
	        spanStartStyle = "";
	      }
	      text = allText.slice(at, at = styles[i++]);
	      style = interpretTokenStyle(styles[i++], builder.cm.options);
	    }
	  }
	}


	// These objects are used to represent the visible (currently drawn)
	// part of the document. A LineView may correspond to multiple
	// logical lines, if those are connected by collapsed ranges.
	function LineView(doc, line, lineN) {
	  // The starting line
	  this.line = line;
	  // Continuing lines, if any
	  this.rest = visualLineContinued(line);
	  // Number of logical lines in this visual line
	  this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1;
	  this.node = this.text = null;
	  this.hidden = lineIsHidden(doc, line);
	}

	// Create a range of LineView objects for the given lines.
	function buildViewArray(cm, from, to) {
	  var array = [], nextPos;
	  for (var pos = from; pos < to; pos = nextPos) {
	    var view = new LineView(cm.doc, getLine(cm.doc, pos), pos);
	    nextPos = pos + view.size;
	    array.push(view);
	  }
	  return array
	}

	var operationGroup = null;

	function pushOperation(op) {
	  if (operationGroup) {
	    operationGroup.ops.push(op);
	  } else {
	    op.ownsGroup = operationGroup = {
	      ops: [op],
	      delayedCallbacks: []
	    };
	  }
	}

	function fireCallbacksForOps(group) {
	  // Calls delayed callbacks and cursorActivity handlers until no
	  // new ones appear
	  var callbacks = group.delayedCallbacks, i = 0;
	  do {
	    for (; i < callbacks.length; i++)
	      { callbacks[i].call(null); }
	    for (var j = 0; j < group.ops.length; j++) {
	      var op = group.ops[j];
	      if (op.cursorActivityHandlers)
	        { while (op.cursorActivityCalled < op.cursorActivityHandlers.length)
	          { op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm); } }
	    }
	  } while (i < callbacks.length)
	}

	function finishOperation(op, endCb) {
	  var group = op.ownsGroup;
	  if (!group) { return }

	  try { fireCallbacksForOps(group); }
	  finally {
	    operationGroup = null;
	    endCb(group);
	  }
	}

	var orphanDelayedCallbacks = null;

	// Often, we want to signal events at a point where we are in the
	// middle of some work, but don't want the handler to start calling
	// other methods on the editor, which might be in an inconsistent
	// state or simply not expect any other events to happen.
	// signalLater looks whether there are any handlers, and schedules
	// them to be executed when the last operation ends, or, if no
	// operation is active, when a timeout fires.
	function signalLater(emitter, type /*, values...*/) {
	  var arr = getHandlers(emitter, type);
	  if (!arr.length) { return }
	  var args = Array.prototype.slice.call(arguments, 2), list;
	  if (operationGroup) {
	    list = operationGroup.delayedCallbacks;
	  } else if (orphanDelayedCallbacks) {
	    list = orphanDelayedCallbacks;
	  } else {
	    list = orphanDelayedCallbacks = [];
	    setTimeout(fireOrphanDelayed, 0);
	  }
	  var loop = function ( i ) {
	    list.push(function () { return arr[i].apply(null, args); });
	  };

	  for (var i = 0; i < arr.length; ++i)
	    loop( i );
	}

	function fireOrphanDelayed() {
	  var delayed = orphanDelayedCallbacks;
	  orphanDelayedCallbacks = null;
	  for (var i = 0; i < delayed.length; ++i) { delayed[i](); }
	}

	// When an aspect of a line changes, a string is added to
	// lineView.changes. This updates the relevant part of the line's
	// DOM structure.
	function updateLineForChanges(cm, lineView, lineN, dims) {
	  for (var j = 0; j < lineView.changes.length; j++) {
	    var type = lineView.changes[j];
	    if (type == "text") { updateLineText(cm, lineView); }
	    else if (type == "gutter") { updateLineGutter(cm, lineView, lineN, dims); }
	    else if (type == "class") { updateLineClasses(cm, lineView); }
	    else if (type == "widget") { updateLineWidgets(cm, lineView, dims); }
	  }
	  lineView.changes = null;
	}

	// Lines with gutter elements, widgets or a background class need to
	// be wrapped, and have the extra elements added to the wrapper div
	function ensureLineWrapped(lineView) {
	  if (lineView.node == lineView.text) {
	    lineView.node = elt("div", null, null, "position: relative");
	    if (lineView.text.parentNode)
	      { lineView.text.parentNode.replaceChild(lineView.node, lineView.text); }
	    lineView.node.appendChild(lineView.text);
	    if (ie && ie_version < 8) { lineView.node.style.zIndex = 2; }
	  }
	  return lineView.node
	}

	function updateLineBackground(cm, lineView) {
	  var cls = lineView.bgClass ? lineView.bgClass + " " + (lineView.line.bgClass || "") : lineView.line.bgClass;
	  if (cls) { cls += " CodeMirror-linebackground"; }
	  if (lineView.background) {
	    if (cls) { lineView.background.className = cls; }
	    else { lineView.background.parentNode.removeChild(lineView.background); lineView.background = null; }
	  } else if (cls) {
	    var wrap = ensureLineWrapped(lineView);
	    lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild);
	    cm.display.input.setUneditable(lineView.background);
	  }
	}

	// Wrapper around buildLineContent which will reuse the structure
	// in display.externalMeasured when possible.
	function getLineContent(cm, lineView) {
	  var ext = cm.display.externalMeasured;
	  if (ext && ext.line == lineView.line) {
	    cm.display.externalMeasured = null;
	    lineView.measure = ext.measure;
	    return ext.built
	  }
	  return buildLineContent(cm, lineView)
	}

	// Redraw the line's text. Interacts with the background and text
	// classes because the mode may output tokens that influence these
	// classes.
	function updateLineText(cm, lineView) {
	  var cls = lineView.text.className;
	  var built = getLineContent(cm, lineView);
	  if (lineView.text == lineView.node) { lineView.node = built.pre; }
	  lineView.text.parentNode.replaceChild(built.pre, lineView.text);
	  lineView.text = built.pre;
	  if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {
	    lineView.bgClass = built.bgClass;
	    lineView.textClass = built.textClass;
	    updateLineClasses(cm, lineView);
	  } else if (cls) {
	    lineView.text.className = cls;
	  }
	}

	function updateLineClasses(cm, lineView) {
	  updateLineBackground(cm, lineView);
	  if (lineView.line.wrapClass)
	    { ensureLineWrapped(lineView).className = lineView.line.wrapClass; }
	  else if (lineView.node != lineView.text)
	    { lineView.node.className = ""; }
	  var textClass = lineView.textClass ? lineView.textClass + " " + (lineView.line.textClass || "") : lineView.line.textClass;
	  lineView.text.className = textClass || "";
	}

	function updateLineGutter(cm, lineView, lineN, dims) {
	  if (lineView.gutter) {
	    lineView.node.removeChild(lineView.gutter);
	    lineView.gutter = null;
	  }
	  if (lineView.gutterBackground) {
	    lineView.node.removeChild(lineView.gutterBackground);
	    lineView.gutterBackground = null;
	  }
	  if (lineView.line.gutterClass) {
	    var wrap = ensureLineWrapped(lineView);
	    lineView.gutterBackground = elt("div", null, "CodeMirror-gutter-background " + lineView.line.gutterClass,
	                                    ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px; width: " + (dims.gutterTotalWidth) + "px"));
	    cm.display.input.setUneditable(lineView.gutterBackground);
	    wrap.insertBefore(lineView.gutterBackground, lineView.text);
	  }
	  var markers = lineView.line.gutterMarkers;
	  if (cm.options.lineNumbers || markers) {
	    var wrap$1 = ensureLineWrapped(lineView);
	    var gutterWrap = lineView.gutter = elt("div", null, "CodeMirror-gutter-wrapper", ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px"));
	    cm.display.input.setUneditable(gutterWrap);
	    wrap$1.insertBefore(gutterWrap, lineView.text);
	    if (lineView.line.gutterClass)
	      { gutterWrap.className += " " + lineView.line.gutterClass; }
	    if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"]))
	      { lineView.lineNumber = gutterWrap.appendChild(
	        elt("div", lineNumberFor(cm.options, lineN),
	            "CodeMirror-linenumber CodeMirror-gutter-elt",
	            ("left: " + (dims.gutterLeft["CodeMirror-linenumbers"]) + "px; width: " + (cm.display.lineNumInnerWidth) + "px"))); }
	    if (markers) { for (var k = 0; k < cm.options.gutters.length; ++k) {
	      var id = cm.options.gutters[k], found = markers.hasOwnProperty(id) && markers[id];
	      if (found)
	        { gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt",
	                                   ("left: " + (dims.gutterLeft[id]) + "px; width: " + (dims.gutterWidth[id]) + "px"))); }
	    } }
	  }
	}

	function updateLineWidgets(cm, lineView, dims) {
	  if (lineView.alignable) { lineView.alignable = null; }
	  for (var node = lineView.node.firstChild, next = (void 0); node; node = next) {
	    next = node.nextSibling;
	    if (node.className == "CodeMirror-linewidget")
	      { lineView.node.removeChild(node); }
	  }
	  insertLineWidgets(cm, lineView, dims);
	}

	// Build a line's DOM representation from scratch
	function buildLineElement(cm, lineView, lineN, dims) {
	  var built = getLineContent(cm, lineView);
	  lineView.text = lineView.node = built.pre;
	  if (built.bgClass) { lineView.bgClass = built.bgClass; }
	  if (built.textClass) { lineView.textClass = built.textClass; }

	  updateLineClasses(cm, lineView);
	  updateLineGutter(cm, lineView, lineN, dims);
	  insertLineWidgets(cm, lineView, dims);
	  return lineView.node
	}

	// A lineView may contain multiple logical lines (when merged by
	// collapsed spans). The widgets for all of them need to be drawn.
	function insertLineWidgets(cm, lineView, dims) {
	  insertLineWidgetsFor(cm, lineView.line, lineView, dims, true);
	  if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)
	    { insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false); } }
	}

	function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {
	  if (!line.widgets) { return }
	  var wrap = ensureLineWrapped(lineView);
	  for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
	    var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget");
	    if (!widget.handleMouseEvents) { node.setAttribute("cm-ignore-events", "true"); }
	    positionLineWidget(widget, node, lineView, dims);
	    cm.display.input.setUneditable(node);
	    if (allowAbove && widget.above)
	      { wrap.insertBefore(node, lineView.gutter || lineView.text); }
	    else
	      { wrap.appendChild(node); }
	    signalLater(widget, "redraw");
	  }
	}

	function positionLineWidget(widget, node, lineView, dims) {
	  if (widget.noHScroll) {
	    (lineView.alignable || (lineView.alignable = [])).push(node);
	    var width = dims.wrapperWidth;
	    node.style.left = dims.fixedPos + "px";
	    if (!widget.coverGutter) {
	      width -= dims.gutterTotalWidth;
	      node.style.paddingLeft = dims.gutterTotalWidth + "px";
	    }
	    node.style.width = width + "px";
	  }
	  if (widget.coverGutter) {
	    node.style.zIndex = 5;
	    node.style.position = "relative";
	    if (!widget.noHScroll) { node.style.marginLeft = -dims.gutterTotalWidth + "px"; }
	  }
	}

	function widgetHeight(widget) {
	  if (widget.height != null) { return widget.height }
	  var cm = widget.doc.cm;
	  if (!cm) { return 0 }
	  if (!contains(document.body, widget.node)) {
	    var parentStyle = "position: relative;";
	    if (widget.coverGutter)
	      { parentStyle += "margin-left: -" + cm.display.gutters.offsetWidth + "px;"; }
	    if (widget.noHScroll)
	      { parentStyle += "width: " + cm.display.wrapper.clientWidth + "px;"; }
	    removeChildrenAndAdd(cm.display.measure, elt("div", [widget.node], null, parentStyle));
	  }
	  return widget.height = widget.node.parentNode.offsetHeight
	}

	// Return true when the given mouse event happened in a widget
	function eventInWidget(display, e) {
	  for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
	    if (!n || (n.nodeType == 1 && n.getAttribute("cm-ignore-events") == "true") ||
	        (n.parentNode == display.sizer && n != display.mover))
	      { return true }
	  }
	}

	// POSITION MEASUREMENT

	function paddingTop(display) {return display.lineSpace.offsetTop}
	function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight}
	function paddingH(display) {
	  if (display.cachedPaddingH) { return display.cachedPaddingH }
	  var e = removeChildrenAndAdd(display.measure, elt("pre", "x"));
	  var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle;
	  var data = {left: parseInt(style.paddingLeft), right: parseInt(style.paddingRight)};
	  if (!isNaN(data.left) && !isNaN(data.right)) { display.cachedPaddingH = data; }
	  return data
	}

	function scrollGap(cm) { return scrollerGap - cm.display.nativeBarWidth }
	function displayWidth(cm) {
	  return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth
	}
	function displayHeight(cm) {
	  return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight
	}

	// Ensure the lineView.wrapping.heights array is populated. This is
	// an array of bottom offsets for the lines that make up a drawn
	// line. When lineWrapping is on, there might be more than one
	// height.
	function ensureLineHeights(cm, lineView, rect) {
	  var wrapping = cm.options.lineWrapping;
	  var curWidth = wrapping && displayWidth(cm);
	  if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {
	    var heights = lineView.measure.heights = [];
	    if (wrapping) {
	      lineView.measure.width = curWidth;
	      var rects = lineView.text.firstChild.getClientRects();
	      for (var i = 0; i < rects.length - 1; i++) {
	        var cur = rects[i], next = rects[i + 1];
	        if (Math.abs(cur.bottom - next.bottom) > 2)
	          { heights.push((cur.bottom + next.top) / 2 - rect.top); }
	      }
	    }
	    heights.push(rect.bottom - rect.top);
	  }
	}

	// Find a line map (mapping character offsets to text nodes) and a
	// measurement cache for the given line number. (A line view might
	// contain multiple lines when collapsed ranges are present.)
	function mapFromLineView(lineView, line, lineN) {
	  if (lineView.line == line)
	    { return {map: lineView.measure.map, cache: lineView.measure.cache} }
	  for (var i = 0; i < lineView.rest.length; i++)
	    { if (lineView.rest[i] == line)
	      { return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i]} } }
	  for (var i$1 = 0; i$1 < lineView.rest.length; i$1++)
	    { if (lineNo(lineView.rest[i$1]) > lineN)
	      { return {map: lineView.measure.maps[i$1], cache: lineView.measure.caches[i$1], before: true} } }
	}

	// Render a line into the hidden node display.externalMeasured. Used
	// when measurement is needed for a line that's not in the viewport.
	function updateExternalMeasurement(cm, line) {
	  line = visualLine(line);
	  var lineN = lineNo(line);
	  var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN);
	  view.lineN = lineN;
	  var built = view.built = buildLineContent(cm, view);
	  view.text = built.pre;
	  removeChildrenAndAdd(cm.display.lineMeasure, built.pre);
	  return view
	}

	// Get a {top, bottom, left, right} box (in line-local coordinates)
	// for a given character.
	function measureChar(cm, line, ch, bias) {
	  return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias)
	}

	// Find a line view that corresponds to the given line number.
	function findViewForLine(cm, lineN) {
	  if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo)
	    { return cm.display.view[findViewIndex(cm, lineN)] }
	  var ext = cm.display.externalMeasured;
	  if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size)
	    { return ext }
	}

	// Measurement can be split in two steps, the set-up work that
	// applies to the whole line, and the measurement of the actual
	// character. Functions like coordsChar, that need to do a lot of
	// measurements in a row, can thus ensure that the set-up work is
	// only done once.
	function prepareMeasureForLine(cm, line) {
	  var lineN = lineNo(line);
	  var view = findViewForLine(cm, lineN);
	  if (view && !view.text) {
	    view = null;
	  } else if (view && view.changes) {
	    updateLineForChanges(cm, view, lineN, getDimensions(cm));
	    cm.curOp.forceUpdate = true;
	  }
	  if (!view)
	    { view = updateExternalMeasurement(cm, line); }

	  var info = mapFromLineView(view, line, lineN);
	  return {
	    line: line, view: view, rect: null,
	    map: info.map, cache: info.cache, before: info.before,
	    hasHeights: false
	  }
	}

	// Given a prepared measurement object, measures the position of an
	// actual character (or fetches it from the cache).
	function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
	  if (prepared.before) { ch = -1; }
	  var key = ch + (bias || ""), found;
	  if (prepared.cache.hasOwnProperty(key)) {
	    found = prepared.cache[key];
	  } else {
	    if (!prepared.rect)
	      { prepared.rect = prepared.view.text.getBoundingClientRect(); }
	    if (!prepared.hasHeights) {
	      ensureLineHeights(cm, prepared.view, prepared.rect);
	      prepared.hasHeights = true;
	    }
	    found = measureCharInner(cm, prepared, ch, bias);
	    if (!found.bogus) { prepared.cache[key] = found; }
	  }
	  return {left: found.left, right: found.right,
	          top: varHeight ? found.rtop : found.top,
	          bottom: varHeight ? found.rbottom : found.bottom}
	}

	var nullRect = {left: 0, right: 0, top: 0, bottom: 0};

	function nodeAndOffsetInLineMap(map$$1, ch, bias) {
	  var node, start, end, collapse, mStart, mEnd;
	  // First, search the line map for the text node corresponding to,
	  // or closest to, the target character.
	  for (var i = 0; i < map$$1.length; i += 3) {
	    mStart = map$$1[i];
	    mEnd = map$$1[i + 1];
	    if (ch < mStart) {
	      start = 0; end = 1;
	      collapse = "left";
	    } else if (ch < mEnd) {
	      start = ch - mStart;
	      end = start + 1;
	    } else if (i == map$$1.length - 3 || ch == mEnd && map$$1[i + 3] > ch) {
	      end = mEnd - mStart;
	      start = end - 1;
	      if (ch >= mEnd) { collapse = "right"; }
	    }
	    if (start != null) {
	      node = map$$1[i + 2];
	      if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right"))
	        { collapse = bias; }
	      if (bias == "left" && start == 0)
	        { while (i && map$$1[i - 2] == map$$1[i - 3] && map$$1[i - 1].insertLeft) {
	          node = map$$1[(i -= 3) + 2];
	          collapse = "left";
	        } }
	      if (bias == "right" && start == mEnd - mStart)
	        { while (i < map$$1.length - 3 && map$$1[i + 3] == map$$1[i + 4] && !map$$1[i + 5].insertLeft) {
	          node = map$$1[(i += 3) + 2];
	          collapse = "right";
	        } }
	      break
	    }
	  }
	  return {node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd}
	}

	function getUsefulRect(rects, bias) {
	  var rect = nullRect;
	  if (bias == "left") { for (var i = 0; i < rects.length; i++) {
	    if ((rect = rects[i]).left != rect.right) { break }
	  } } else { for (var i$1 = rects.length - 1; i$1 >= 0; i$1--) {
	    if ((rect = rects[i$1]).left != rect.right) { break }
	  } }
	  return rect
	}

	function measureCharInner(cm, prepared, ch, bias) {
	  var place = nodeAndOffsetInLineMap(prepared.map, ch, bias);
	  var node = place.node, start = place.start, end = place.end, collapse = place.collapse;

	  var rect;
	  if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
	    for (var i$1 = 0; i$1 < 4; i$1++) { // Retry a maximum of 4 times when nonsense rectangles are returned
	      while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) { --start; }
	      while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) { ++end; }
	      if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart)
	        { rect = node.parentNode.getBoundingClientRect(); }
	      else
	        { rect = getUsefulRect(range(node, start, end).getClientRects(), bias); }
	      if (rect.left || rect.right || start == 0) { break }
	      end = start;
	      start = start - 1;
	      collapse = "right";
	    }
	    if (ie && ie_version < 11) { rect = maybeUpdateRectForZooming(cm.display.measure, rect); }
	  } else { // If it is a widget, simply get the box for the whole widget.
	    if (start > 0) { collapse = bias = "right"; }
	    var rects;
	    if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1)
	      { rect = rects[bias == "right" ? rects.length - 1 : 0]; }
	    else
	      { rect = node.getBoundingClientRect(); }
	  }
	  if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {
	    var rSpan = node.parentNode.getClientRects()[0];
	    if (rSpan)
	      { rect = {left: rSpan.left, right: rSpan.left + charWidth(cm.display), top: rSpan.top, bottom: rSpan.bottom}; }
	    else
	      { rect = nullRect; }
	  }

	  var rtop = rect.top - prepared.rect.top, rbot = rect.bottom - prepared.rect.top;
	  var mid = (rtop + rbot) / 2;
	  var heights = prepared.view.measure.heights;
	  var i = 0;
	  for (; i < heights.length - 1; i++)
	    { if (mid < heights[i]) { break } }
	  var top = i ? heights[i - 1] : 0, bot = heights[i];
	  var result = {left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
	                right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
	                top: top, bottom: bot};
	  if (!rect.left && !rect.right) { result.bogus = true; }
	  if (!cm.options.singleCursorHeightPerLine) { result.rtop = rtop; result.rbottom = rbot; }

	  return result
	}

	// Work around problem with bounding client rects on ranges being
	// returned incorrectly when zoomed on IE10 and below.
	function maybeUpdateRectForZooming(measure, rect) {
	  if (!window.screen || screen.logicalXDPI == null ||
	      screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure))
	    { return rect }
	  var scaleX = screen.logicalXDPI / screen.deviceXDPI;
	  var scaleY = screen.logicalYDPI / screen.deviceYDPI;
	  return {left: rect.left * scaleX, right: rect.right * scaleX,
	          top: rect.top * scaleY, bottom: rect.bottom * scaleY}
	}

	function clearLineMeasurementCacheFor(lineView) {
	  if (lineView.measure) {
	    lineView.measure.cache = {};
	    lineView.measure.heights = null;
	    if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)
	      { lineView.measure.caches[i] = {}; } }
	  }
	}

	function clearLineMeasurementCache(cm) {
	  cm.display.externalMeasure = null;
	  removeChildren(cm.display.lineMeasure);
	  for (var i = 0; i < cm.display.view.length; i++)
	    { clearLineMeasurementCacheFor(cm.display.view[i]); }
	}

	function clearCaches(cm) {
	  clearLineMeasurementCache(cm);
	  cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null;
	  if (!cm.options.lineWrapping) { cm.display.maxLineChanged = true; }
	  cm.display.lineNumChars = null;
	}

	function pageScrollX() {
	  // Work around https://bugs.chromium.org/p/chromium/issues/detail?id=489206
	  // which causes page_Offset and bounding client rects to use
	  // different reference viewports and invalidate our calculations.
	  if (chrome && android) { return -(document.body.getBoundingClientRect().left - parseInt(getComputedStyle(document.body).marginLeft)) }
	  return window.pageXOffset || (document.documentElement || document.body).scrollLeft
	}
	function pageScrollY() {
	  if (chrome && android) { return -(document.body.getBoundingClientRect().top - parseInt(getComputedStyle(document.body).marginTop)) }
	  return window.pageYOffset || (document.documentElement || document.body).scrollTop
	}

	// Converts a {top, bottom, left, right} box from line-local
	// coordinates into another coordinate system. Context may be one of
	// "line", "div" (display.lineDiv), "local"./null (editor), "window",
	// or "page".
	function intoCoordSystem(cm, lineObj, rect, context, includeWidgets) {
	  if (!includeWidgets && lineObj.widgets) { for (var i = 0; i < lineObj.widgets.length; ++i) { if (lineObj.widgets[i].above) {
	    var size = widgetHeight(lineObj.widgets[i]);
	    rect.top += size; rect.bottom += size;
	  } } }
	  if (context == "line") { return rect }
	  if (!context) { context = "local"; }
	  var yOff = heightAtLine(lineObj);
	  if (context == "local") { yOff += paddingTop(cm.display); }
	  else { yOff -= cm.display.viewOffset; }
	  if (context == "page" || context == "window") {
	    var lOff = cm.display.lineSpace.getBoundingClientRect();
	    yOff += lOff.top + (context == "window" ? 0 : pageScrollY());
	    var xOff = lOff.left + (context == "window" ? 0 : pageScrollX());
	    rect.left += xOff; rect.right += xOff;
	  }
	  rect.top += yOff; rect.bottom += yOff;
	  return rect
	}

	// Coverts a box from "div" coords to another coordinate system.
	// Context may be "window", "page", "div", or "local"./null.
	function fromCoordSystem(cm, coords, context) {
	  if (context == "div") { return coords }
	  var left = coords.left, top = coords.top;
	  // First move into "page" coordinate system
	  if (context == "page") {
	    left -= pageScrollX();
	    top -= pageScrollY();
	  } else if (context == "local" || !context) {
	    var localBox = cm.display.sizer.getBoundingClientRect();
	    left += localBox.left;
	    top += localBox.top;
	  }

	  var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect();
	  return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top}
	}

	function charCoords(cm, pos, context, lineObj, bias) {
	  if (!lineObj) { lineObj = getLine(cm.doc, pos.line); }
	  return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context)
	}

	// Returns a box for a given cursor position, which may have an
	// 'other' property containing the position of the secondary cursor
	// on a bidi boundary.
	// A cursor Pos(line, char, "before") is on the same visual line as `char - 1`
	// and after `char - 1` in writing order of `char - 1`
	// A cursor Pos(line, char, "after") is on the same visual line as `char`
	// and before `char` in writing order of `char`
	// Examples (upper-case letters are RTL, lower-case are LTR):
	//     Pos(0, 1, ...)
	//     before   after
	// ab     a|b     a|b
	// aB     a|B     aB|
	// Ab     |Ab     A|b
	// AB     B|A     B|A
	// Every position after the last character on a line is considered to stick
	// to the last character on the line.
	function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
	  lineObj = lineObj || getLine(cm.doc, pos.line);
	  if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj); }
	  function get(ch, right) {
	    var m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight);
	    if (right) { m.left = m.right; } else { m.right = m.left; }
	    return intoCoordSystem(cm, lineObj, m, context)
	  }
	  var order = getOrder(lineObj, cm.doc.direction), ch = pos.ch, sticky = pos.sticky;
	  if (ch >= lineObj.text.length) {
	    ch = lineObj.text.length;
	    sticky = "before";
	  } else if (ch <= 0) {
	    ch = 0;
	    sticky = "after";
	  }
	  if (!order) { return get(sticky == "before" ? ch - 1 : ch, sticky == "before") }

	  function getBidi(ch, partPos, invert) {
	    var part = order[partPos], right = (part.level % 2) != 0;
	    return get(invert ? ch - 1 : ch, right != invert)
	  }
	  var partPos = getBidiPartAt(order, ch, sticky);
	  var other = bidiOther;
	  var val = getBidi(ch, partPos, sticky == "before");
	  if (other != null) { val.other = getBidi(ch, other, sticky != "before"); }
	  return val
	}

	// Used to cheaply estimate the coordinates for a position. Used for
	// intermediate scroll updates.
	function estimateCoords(cm, pos) {
	  var left = 0;
	  pos = clipPos(cm.doc, pos);
	  if (!cm.options.lineWrapping) { left = charWidth(cm.display) * pos.ch; }
	  var lineObj = getLine(cm.doc, pos.line);
	  var top = heightAtLine(lineObj) + paddingTop(cm.display);
	  return {left: left, right: left, top: top, bottom: top + lineObj.height}
	}

	// Positions returned by coordsChar contain some extra information.
	// xRel is the relative x position of the input coordinates compared
	// to the found position (so xRel > 0 means the coordinates are to
	// the right of the character position, for example). When outside
	// is true, that means the coordinates lie outside the line's
	// vertical range.
	function PosWithInfo(line, ch, sticky, outside, xRel) {
	  var pos = Pos(line, ch, sticky);
	  pos.xRel = xRel;
	  if (outside) { pos.outside = true; }
	  return pos
	}

	// Compute the character position closest to the given coordinates.
	// Input must be lineSpace-local ("div" coordinate system).
	function coordsChar(cm, x, y) {
	  var doc = cm.doc;
	  y += cm.display.viewOffset;
	  if (y < 0) { return PosWithInfo(doc.first, 0, null, true, -1) }
	  var lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1;
	  if (lineN > last)
	    { return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, null, true, 1) }
	  if (x < 0) { x = 0; }

	  var lineObj = getLine(doc, lineN);
	  for (;;) {
	    var found = coordsCharInner(cm, lineObj, lineN, x, y);
	    var merged = collapsedSpanAtEnd(lineObj);
	    var mergedPos = merged && merged.find(0, true);
	    if (merged && (found.ch > mergedPos.from.ch || found.ch == mergedPos.from.ch && found.xRel > 0))
	      { lineN = lineNo(lineObj = mergedPos.to.line); }
	    else
	      { return found }
	  }
	}

	function wrappedLineExtent(cm, lineObj, preparedMeasure, y) {
	  var measure = function (ch) { return intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, ch), "line"); };
	  var end = lineObj.text.length;
	  var begin = findFirst(function (ch) { return measure(ch - 1).bottom <= y; }, end, 0);
	  end = findFirst(function (ch) { return measure(ch).top > y; }, begin, end);
	  return {begin: begin, end: end}
	}

	function wrappedLineExtentChar(cm, lineObj, preparedMeasure, target) {
	  var targetTop = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, target), "line").top;
	  return wrappedLineExtent(cm, lineObj, preparedMeasure, targetTop)
	}

	function coordsCharInner(cm, lineObj, lineNo$$1, x, y) {
	  y -= heightAtLine(lineObj);
	  var begin = 0, end = lineObj.text.length;
	  var preparedMeasure = prepareMeasureForLine(cm, lineObj);
	  var pos;
	  var order = getOrder(lineObj, cm.doc.direction);
	  if (order) {
	    if (cm.options.lineWrapping) {
	      var assign;
	      ((assign = wrappedLineExtent(cm, lineObj, preparedMeasure, y), begin = assign.begin, end = assign.end, assign));
	    }
	    pos = new Pos(lineNo$$1, Math.floor(begin + (end - begin) / 2));
	    var beginLeft = cursorCoords(cm, pos, "line", lineObj, preparedMeasure).left;
	    var dir = beginLeft < x ? 1 : -1;
	    var prevDiff, diff = beginLeft - x, prevPos;
	    var steps = Math.ceil((end - begin) / 4);
	    outer: do {
	      prevDiff = diff;
	      prevPos = pos;
	      var i = 0;
	      for (; i < steps; ++i) {
	        var prevPos$1 = pos;
	        pos = moveVisually(cm, lineObj, pos, dir);
	        if (pos == null || pos.ch < begin || end <= (pos.sticky == "before" ? pos.ch - 1 : pos.ch)) {
	          pos = prevPos$1;
	          break outer
	        }
	      }
	      diff = cursorCoords(cm, pos, "line", lineObj, preparedMeasure).left - x;
	      if (steps > 1) {
	        var diff_change_per_step = Math.abs(diff - prevDiff) / steps;
	        steps = Math.min(steps, Math.ceil(Math.abs(diff) / diff_change_per_step));
	        dir = diff < 0 ? 1 : -1;
	      }
	    } while (diff != 0 && (steps > 1 || ((dir < 0) != (diff < 0) && (Math.abs(diff) <= Math.abs(prevDiff)))))
	    if (Math.abs(diff) > Math.abs(prevDiff)) {
	      if ((diff < 0) == (prevDiff < 0)) { throw new Error("Broke out of infinite loop in coordsCharInner") }
	      pos = prevPos;
	    }
	  } else {
	    var ch = findFirst(function (ch) {
	      var box = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, ch), "line");
	      if (box.top > y) {
	        // For the cursor stickiness
	        end = Math.min(ch, end);
	        return true
	      }
	      else if (box.bottom <= y) { return false }
	      else if (box.left > x) { return true }
	      else if (box.right < x) { return false }
	      else { return (x - box.left < box.right - x) }
	    }, begin, end);
	    ch = skipExtendingChars(lineObj.text, ch, 1);
	    pos = new Pos(lineNo$$1, ch, ch == end ? "before" : "after");
	  }
	  var coords = cursorCoords(cm, pos, "line", lineObj, preparedMeasure);
	  if (y < coords.top || coords.bottom < y) { pos.outside = true; }
	  pos.xRel = x < coords.left ? -1 : (x > coords.right ? 1 : 0);
	  return pos
	}

	var measureText;
	// Compute the default text height.
	function textHeight(display) {
	  if (display.cachedTextHeight != null) { return display.cachedTextHeight }
	  if (measureText == null) {
	    measureText = elt("pre");
	    // Measure a bunch of lines, for browsers that compute
	    // fractional heights.
	    for (var i = 0; i < 49; ++i) {
	      measureText.appendChild(document.createTextNode("x"));
	      measureText.appendChild(elt("br"));
	    }
	    measureText.appendChild(document.createTextNode("x"));
	  }
	  removeChildrenAndAdd(display.measure, measureText);
	  var height = measureText.offsetHeight / 50;
	  if (height > 3) { display.cachedTextHeight = height; }
	  removeChildren(display.measure);
	  return height || 1
	}

	// Compute the default character width.
	function charWidth(display) {
	  if (display.cachedCharWidth != null) { return display.cachedCharWidth }
	  var anchor = elt("span", "xxxxxxxxxx");
	  var pre = elt("pre", [anchor]);
	  removeChildrenAndAdd(display.measure, pre);
	  var rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10;
	  if (width > 2) { display.cachedCharWidth = width; }
	  return width || 10
	}

	// Do a bulk-read of the DOM positions and sizes needed to draw the
	// view, so that we don't interleave reading and writing to the DOM.
	function getDimensions(cm) {
	  var d = cm.display, left = {}, width = {};
	  var gutterLeft = d.gutters.clientLeft;
	  for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
	    left[cm.options.gutters[i]] = n.offsetLeft + n.clientLeft + gutterLeft;
	    width[cm.options.gutters[i]] = n.clientWidth;
	  }
	  return {fixedPos: compensateForHScroll(d),
	          gutterTotalWidth: d.gutters.offsetWidth,
	          gutterLeft: left,
	          gutterWidth: width,
	          wrapperWidth: d.wrapper.clientWidth}
	}

	// Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
	// but using getBoundingClientRect to get a sub-pixel-accurate
	// result.
	function compensateForHScroll(display) {
	  return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left
	}

	// Returns a function that estimates the height of a line, to use as
	// first approximation until the line becomes visible (and is thus
	// properly measurable).
	function estimateHeight(cm) {
	  var th = textHeight(cm.display), wrapping = cm.options.lineWrapping;
	  var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);
	  return function (line) {
	    if (lineIsHidden(cm.doc, line)) { return 0 }

	    var widgetsHeight = 0;
	    if (line.widgets) { for (var i = 0; i < line.widgets.length; i++) {
	      if (line.widgets[i].height) { widgetsHeight += line.widgets[i].height; }
	    } }

	    if (wrapping)
	      { return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th }
	    else
	      { return widgetsHeight + th }
	  }
	}

	function estimateLineHeights(cm) {
	  var doc = cm.doc, est = estimateHeight(cm);
	  doc.iter(function (line) {
	    var estHeight = est(line);
	    if (estHeight != line.height) { updateLineHeight(line, estHeight); }
	  });
	}

	// Given a mouse event, find the corresponding position. If liberal
	// is false, it checks whether a gutter or scrollbar was clicked,
	// and returns null if it was. forRect is used by rectangular
	// selections, and tries to estimate a character position even for
	// coordinates beyond the right of the text.
	function posFromMouse(cm, e, liberal, forRect) {
	  var display = cm.display;
	  if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") { return null }

	  var x, y, space = display.lineSpace.getBoundingClientRect();
	  // Fails unpredictably on IE[67] when mouse is dragged around quickly.
	  try { x = e.clientX - space.left; y = e.clientY - space.top; }
	  catch (e) { return null }
	  var coords = coordsChar(cm, x, y), line;
	  if (forRect && coords.xRel == 1 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
	    var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length;
	    coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff));
	  }
	  return coords
	}

	// Find the view element corresponding to a given line. Return null
	// when the line isn't visible.
	function findViewIndex(cm, n) {
	  if (n >= cm.display.viewTo) { return null }
	  n -= cm.display.viewFrom;
	  if (n < 0) { return null }
	  var view = cm.display.view;
	  for (var i = 0; i < view.length; i++) {
	    n -= view[i].size;
	    if (n < 0) { return i }
	  }
	}

	function updateSelection(cm) {
	  cm.display.input.showSelection(cm.display.input.prepareSelection());
	}

	function prepareSelection(cm, primary) {
	  var doc = cm.doc, result = {};
	  var curFragment = result.cursors = document.createDocumentFragment();
	  var selFragment = result.selection = document.createDocumentFragment();

	  for (var i = 0; i < doc.sel.ranges.length; i++) {
	    if (primary === false && i == doc.sel.primIndex) { continue }
	    var range$$1 = doc.sel.ranges[i];
	    if (range$$1.from().line >= cm.display.viewTo || range$$1.to().line < cm.display.viewFrom) { continue }
	    var collapsed = range$$1.empty();
	    if (collapsed || cm.options.showCursorWhenSelecting)
	      { drawSelectionCursor(cm, range$$1.head, curFragment); }
	    if (!collapsed)
	      { drawSelectionRange(cm, range$$1, selFragment); }
	  }
	  return result
	}

	// Draws a cursor for the given range
	function drawSelectionCursor(cm, head, output) {
	  var pos = cursorCoords(cm, head, "div", null, null, !cm.options.singleCursorHeightPerLine);

	  var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"));
	  cursor.style.left = pos.left + "px";
	  cursor.style.top = pos.top + "px";
	  cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";

	  if (pos.other) {
	    // Secondary cursor, shown when on a 'jump' in bi-directional text
	    var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"));
	    otherCursor.style.display = "";
	    otherCursor.style.left = pos.other.left + "px";
	    otherCursor.style.top = pos.other.top + "px";
	    otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";
	  }
	}

	// Draws the given range as a highlighted selection
	function drawSelectionRange(cm, range$$1, output) {
	  var display = cm.display, doc = cm.doc;
	  var fragment = document.createDocumentFragment();
	  var padding = paddingH(cm.display), leftSide = padding.left;
	  var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right;

	  function add(left, top, width, bottom) {
	    if (top < 0) { top = 0; }
	    top = Math.round(top);
	    bottom = Math.round(bottom);
	    fragment.appendChild(elt("div", null, "CodeMirror-selected", ("position: absolute; left: " + left + "px;\n                             top: " + top + "px; width: " + (width == null ? rightSide - left : width) + "px;\n                             height: " + (bottom - top) + "px")));
	  }

	  function drawForLine(line, fromArg, toArg) {
	    var lineObj = getLine(doc, line);
	    var lineLen = lineObj.text.length;
	    var start, end;
	    function coords(ch, bias) {
	      return charCoords(cm, Pos(line, ch), "div", lineObj, bias)
	    }

	    iterateBidiSections(getOrder(lineObj, doc.direction), fromArg || 0, toArg == null ? lineLen : toArg, function (from, to, dir) {
	      var leftPos = coords(from, "left"), rightPos, left, right;
	      if (from == to) {
	        rightPos = leftPos;
	        left = right = leftPos.left;
	      } else {
	        rightPos = coords(to - 1, "right");
	        if (dir == "rtl") { var tmp = leftPos; leftPos = rightPos; rightPos = tmp; }
	        left = leftPos.left;
	        right = rightPos.right;
	      }
	      if (fromArg == null && from == 0) { left = leftSide; }
	      if (rightPos.top - leftPos.top > 3) { // Different lines, draw top part
	        add(left, leftPos.top, null, leftPos.bottom);
	        left = leftSide;
	        if (leftPos.bottom < rightPos.top) { add(left, leftPos.bottom, null, rightPos.top); }
	      }
	      if (toArg == null && to == lineLen) { right = rightSide; }
	      if (!start || leftPos.top < start.top || leftPos.top == start.top && leftPos.left < start.left)
	        { start = leftPos; }
	      if (!end || rightPos.bottom > end.bottom || rightPos.bottom == end.bottom && rightPos.right > end.right)
	        { end = rightPos; }
	      if (left < leftSide + 1) { left = leftSide; }
	      add(left, rightPos.top, right - left, rightPos.bottom);
	    });
	    return {start: start, end: end}
	  }

	  var sFrom = range$$1.from(), sTo = range$$1.to();
	  if (sFrom.line == sTo.line) {
	    drawForLine(sFrom.line, sFrom.ch, sTo.ch);
	  } else {
	    var fromLine = getLine(doc, sFrom.line), toLine = getLine(doc, sTo.line);
	    var singleVLine = visualLine(fromLine) == visualLine(toLine);
	    var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end;
	    var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start;
	    if (singleVLine) {
	      if (leftEnd.top < rightStart.top - 2) {
	        add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);
	        add(leftSide, rightStart.top, rightStart.left, rightStart.bottom);
	      } else {
	        add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);
	      }
	    }
	    if (leftEnd.bottom < rightStart.top)
	      { add(leftSide, leftEnd.bottom, null, rightStart.top); }
	  }

	  output.appendChild(fragment);
	}

	// Cursor-blinking
	function restartBlink(cm) {
	  if (!cm.state.focused) { return }
	  var display = cm.display;
	  clearInterval(display.blinker);
	  var on = true;
	  display.cursorDiv.style.visibility = "";
	  if (cm.options.cursorBlinkRate > 0)
	    { display.blinker = setInterval(function () { return display.cursorDiv.style.visibility = (on = !on) ? "" : "hidden"; },
	      cm.options.cursorBlinkRate); }
	  else if (cm.options.cursorBlinkRate < 0)
	    { display.cursorDiv.style.visibility = "hidden"; }
	}

	function ensureFocus(cm) {
	  if (!cm.state.focused) { cm.display.input.focus(); onFocus(cm); }
	}

	function delayBlurEvent(cm) {
	  cm.state.delayingBlurEvent = true;
	  setTimeout(function () { if (cm.state.delayingBlurEvent) {
	    cm.state.delayingBlurEvent = false;
	    onBlur(cm);
	  } }, 100);
	}

	function onFocus(cm, e) {
	  if (cm.state.delayingBlurEvent) { cm.state.delayingBlurEvent = false; }

	  if (cm.options.readOnly == "nocursor") { return }
	  if (!cm.state.focused) {
	    signal(cm, "focus", cm, e);
	    cm.state.focused = true;
	    addClass(cm.display.wrapper, "CodeMirror-focused");
	    // This test prevents this from firing when a context
	    // menu is closed (since the input reset would kill the
	    // select-all detection hack)
	    if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
	      cm.display.input.reset();
	      if (webkit) { setTimeout(function () { return cm.display.input.reset(true); }, 20); } // Issue #1730
	    }
	    cm.display.input.receivedFocus();
	  }
	  restartBlink(cm);
	}
	function onBlur(cm, e) {
	  if (cm.state.delayingBlurEvent) { return }

	  if (cm.state.focused) {
	    signal(cm, "blur", cm, e);
	    cm.state.focused = false;
	    rmClass(cm.display.wrapper, "CodeMirror-focused");
	  }
	  clearInterval(cm.display.blinker);
	  setTimeout(function () { if (!cm.state.focused) { cm.display.shift = false; } }, 150);
	}

	// Read the actual heights of the rendered lines, and update their
	// stored heights to match.
	function updateHeightsInViewport(cm) {
	  var display = cm.display;
	  var prevBottom = display.lineDiv.offsetTop;
	  for (var i = 0; i < display.view.length; i++) {
	    var cur = display.view[i], height = (void 0);
	    if (cur.hidden) { continue }
	    if (ie && ie_version < 8) {
	      var bot = cur.node.offsetTop + cur.node.offsetHeight;
	      height = bot - prevBottom;
	      prevBottom = bot;
	    } else {
	      var box = cur.node.getBoundingClientRect();
	      height = box.bottom - box.top;
	    }
	    var diff = cur.line.height - height;
	    if (height < 2) { height = textHeight(display); }
	    if (diff > .005 || diff < -.005) {
	      updateLineHeight(cur.line, height);
	      updateWidgetHeight(cur.line);
	      if (cur.rest) { for (var j = 0; j < cur.rest.length; j++)
	        { updateWidgetHeight(cur.rest[j]); } }
	    }
	  }
	}

	// Read and store the height of line widgets associated with the
	// given line.
	function updateWidgetHeight(line) {
	  if (line.widgets) { for (var i = 0; i < line.widgets.length; ++i)
	    { line.widgets[i].height = line.widgets[i].node.parentNode.offsetHeight; } }
	}

	// Compute the lines that are visible in a given viewport (defaults
	// the the current scroll position). viewport may contain top,
	// height, and ensure (see op.scrollToPos) properties.
	function visibleLines(display, doc, viewport) {
	  var top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop;
	  top = Math.floor(top - paddingTop(display));
	  var bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight;

	  var from = lineAtHeight(doc, top), to = lineAtHeight(doc, bottom);
	  // Ensure is a {from: {line, ch}, to: {line, ch}} object, and
	  // forces those lines into the viewport (if possible).
	  if (viewport && viewport.ensure) {
	    var ensureFrom = viewport.ensure.from.line, ensureTo = viewport.ensure.to.line;
	    if (ensureFrom < from) {
	      from = ensureFrom;
	      to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight);
	    } else if (Math.min(ensureTo, doc.lastLine()) >= to) {
	      from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight);
	      to = ensureTo;
	    }
	  }
	  return {from: from, to: Math.max(to, from + 1)}
	}

	// Re-align line numbers and gutter marks to compensate for
	// horizontal scrolling.
	function alignHorizontally(cm) {
	  var display = cm.display, view = display.view;
	  if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) { return }
	  var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;
	  var gutterW = display.gutters.offsetWidth, left = comp + "px";
	  for (var i = 0; i < view.length; i++) { if (!view[i].hidden) {
	    if (cm.options.fixedGutter) {
	      if (view[i].gutter)
	        { view[i].gutter.style.left = left; }
	      if (view[i].gutterBackground)
	        { view[i].gutterBackground.style.left = left; }
	    }
	    var align = view[i].alignable;
	    if (align) { for (var j = 0; j < align.length; j++)
	      { align[j].style.left = left; } }
	  } }
	  if (cm.options.fixedGutter)
	    { display.gutters.style.left = (comp + gutterW) + "px"; }
	}

	// Used to ensure that the line number gutter is still the right
	// size for the current document size. Returns true when an update
	// is needed.
	function maybeUpdateLineNumberWidth(cm) {
	  if (!cm.options.lineNumbers) { return false }
	  var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display;
	  if (last.length != display.lineNumChars) {
	    var test = display.measure.appendChild(elt("div", [elt("div", last)],
	                                               "CodeMirror-linenumber CodeMirror-gutter-elt"));
	    var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;
	    display.lineGutter.style.width = "";
	    display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1;
	    display.lineNumWidth = display.lineNumInnerWidth + padding;
	    display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
	    display.lineGutter.style.width = display.lineNumWidth + "px";
	    updateGutterSpace(cm);
	    return true
	  }
	  return false
	}

	// SCROLLING THINGS INTO VIEW

	// If an editor sits on the top or bottom of the window, partially
	// scrolled out of view, this ensures that the cursor is visible.
	function maybeScrollWindow(cm, rect) {
	  if (signalDOMEvent(cm, "scrollCursorIntoView")) { return }

	  var display = cm.display, box = display.sizer.getBoundingClientRect(), doScroll = null;
	  if (rect.top + box.top < 0) { doScroll = true; }
	  else if (rect.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) { doScroll = false; }
	  if (doScroll != null && !phantom) {
	    var scrollNode = elt("div", "\u200b", null, ("position: absolute;\n                         top: " + (rect.top - display.viewOffset - paddingTop(cm.display)) + "px;\n                         height: " + (rect.bottom - rect.top + scrollGap(cm) + display.barHeight) + "px;\n                         left: " + (rect.left) + "px; width: " + (Math.max(2, rect.right - rect.left)) + "px;"));
	    cm.display.lineSpace.appendChild(scrollNode);
	    scrollNode.scrollIntoView(doScroll);
	    cm.display.lineSpace.removeChild(scrollNode);
	  }
	}

	// Scroll a given position into view (immediately), verifying that
	// it actually became visible (as line heights are accurately
	// measured, the position of something may 'drift' during drawing).
	function scrollPosIntoView(cm, pos, end, margin) {
	  if (margin == null) { margin = 0; }
	  var rect;
	  if (!cm.options.lineWrapping && pos == end) {
	    // Set pos and end to the cursor positions around the character pos sticks to
	    // If pos.sticky == "before", that is around pos.ch - 1, otherwise around pos.ch
	    // If pos == Pos(_, 0, "before"), pos and end are unchanged
	    pos = pos.ch ? Pos(pos.line, pos.sticky == "before" ? pos.ch - 1 : pos.ch, "after") : pos;
	    end = pos.sticky == "before" ? Pos(pos.line, pos.ch + 1, "before") : pos;
	  }
	  for (var limit = 0; limit < 5; limit++) {
	    var changed = false;
	    var coords = cursorCoords(cm, pos);
	    var endCoords = !end || end == pos ? coords : cursorCoords(cm, end);
	    rect = {left: Math.min(coords.left, endCoords.left),
	            top: Math.min(coords.top, endCoords.top) - margin,
	            right: Math.max(coords.left, endCoords.left),
	            bottom: Math.max(coords.bottom, endCoords.bottom) + margin};
	    var scrollPos = calculateScrollPos(cm, rect);
	    var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft;
	    if (scrollPos.scrollTop != null) {
	      updateScrollTop(cm, scrollPos.scrollTop);
	      if (Math.abs(cm.doc.scrollTop - startTop) > 1) { changed = true; }
	    }
	    if (scrollPos.scrollLeft != null) {
	      setScrollLeft(cm, scrollPos.scrollLeft);
	      if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) { changed = true; }
	    }
	    if (!changed) { break }
	  }
	  return rect
	}

	// Scroll a given set of coordinates into view (immediately).
	function scrollIntoView(cm, rect) {
	  var scrollPos = calculateScrollPos(cm, rect);
	  if (scrollPos.scrollTop != null) { updateScrollTop(cm, scrollPos.scrollTop); }
	  if (scrollPos.scrollLeft != null) { setScrollLeft(cm, scrollPos.scrollLeft); }
	}

	// Calculate a new scroll position needed to scroll the given
	// rectangle into view. Returns an object with scrollTop and
	// scrollLeft properties. When these are undefined, the
	// vertical/horizontal position does not need to be adjusted.
	function calculateScrollPos(cm, rect) {
	  var display = cm.display, snapMargin = textHeight(cm.display);
	  if (rect.top < 0) { rect.top = 0; }
	  var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop;
	  var screen = displayHeight(cm), result = {};
	  if (rect.bottom - rect.top > screen) { rect.bottom = rect.top + screen; }
	  var docBottom = cm.doc.height + paddingVert(display);
	  var atTop = rect.top < snapMargin, atBottom = rect.bottom > docBottom - snapMargin;
	  if (rect.top < screentop) {
	    result.scrollTop = atTop ? 0 : rect.top;
	  } else if (rect.bottom > screentop + screen) {
	    var newTop = Math.min(rect.top, (atBottom ? docBottom : rect.bottom) - screen);
	    if (newTop != screentop) { result.scrollTop = newTop; }
	  }

	  var screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft;
	  var screenw = displayWidth(cm) - (cm.options.fixedGutter ? display.gutters.offsetWidth : 0);
	  var tooWide = rect.right - rect.left > screenw;
	  if (tooWide) { rect.right = rect.left + screenw; }
	  if (rect.left < 10)
	    { result.scrollLeft = 0; }
	  else if (rect.left < screenleft)
	    { result.scrollLeft = Math.max(0, rect.left - (tooWide ? 0 : 10)); }
	  else if (rect.right > screenw + screenleft - 3)
	    { result.scrollLeft = rect.right + (tooWide ? 0 : 10) - screenw; }
	  return result
	}

	// Store a relative adjustment to the scroll position in the current
	// operation (to be applied when the operation finishes).
	function addToScrollTop(cm, top) {
	  if (top == null) { return }
	  resolveScrollToPos(cm);
	  cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top;
	}

	// Make sure that at the end of the operation the current cursor is
	// shown.
	function ensureCursorVisible(cm) {
	  resolveScrollToPos(cm);
	  var cur = cm.getCursor();
	  cm.curOp.scrollToPos = {from: cur, to: cur, margin: cm.options.cursorScrollMargin};
	}

	function scrollToCoords(cm, x, y) {
	  if (x != null || y != null) { resolveScrollToPos(cm); }
	  if (x != null) { cm.curOp.scrollLeft = x; }
	  if (y != null) { cm.curOp.scrollTop = y; }
	}

	function scrollToRange(cm, range$$1) {
	  resolveScrollToPos(cm);
	  cm.curOp.scrollToPos = range$$1;
	}

	// When an operation has its scrollToPos property set, and another
	// scroll action is applied before the end of the operation, this
	// 'simulates' scrolling that position into view in a cheap way, so
	// that the effect of intermediate scroll commands is not ignored.
	function resolveScrollToPos(cm) {
	  var range$$1 = cm.curOp.scrollToPos;
	  if (range$$1) {
	    cm.curOp.scrollToPos = null;
	    var from = estimateCoords(cm, range$$1.from), to = estimateCoords(cm, range$$1.to);
	    scrollToCoordsRange(cm, from, to, range$$1.margin);
	  }
	}

	function scrollToCoordsRange(cm, from, to, margin) {
	  var sPos = calculateScrollPos(cm, {
	    left: Math.min(from.left, to.left),
	    top: Math.min(from.top, to.top) - margin,
	    right: Math.max(from.right, to.right),
	    bottom: Math.max(from.bottom, to.bottom) + margin
	  });
	  scrollToCoords(cm, sPos.scrollLeft, sPos.scrollTop);
	}

	// Sync the scrollable area and scrollbars, ensure the viewport
	// covers the visible area.
	function updateScrollTop(cm, val) {
	  if (Math.abs(cm.doc.scrollTop - val) < 2) { return }
	  if (!gecko) { updateDisplaySimple(cm, {top: val}); }
	  setScrollTop(cm, val, true);
	  if (gecko) { updateDisplaySimple(cm); }
	  startWorker(cm, 100);
	}

	function setScrollTop(cm, val, forceScroll) {
	  val = Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight, val);
	  if (cm.display.scroller.scrollTop == val && !forceScroll) { return }
	  cm.doc.scrollTop = val;
	  cm.display.scrollbars.setScrollTop(val);
	  if (cm.display.scroller.scrollTop != val) { cm.display.scroller.scrollTop = val; }
	}

	// Sync scroller and scrollbar, ensure the gutter elements are
	// aligned.
	function setScrollLeft(cm, val, isScroller, forceScroll) {
	  val = Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth);
	  if ((isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) && !forceScroll) { return }
	  cm.doc.scrollLeft = val;
	  alignHorizontally(cm);
	  if (cm.display.scroller.scrollLeft != val) { cm.display.scroller.scrollLeft = val; }
	  cm.display.scrollbars.setScrollLeft(val);
	}

	// SCROLLBARS

	// Prepare DOM reads needed to update the scrollbars. Done in one
	// shot to minimize update/measure roundtrips.
	function measureForScrollbars(cm) {
	  var d = cm.display, gutterW = d.gutters.offsetWidth;
	  var docH = Math.round(cm.doc.height + paddingVert(cm.display));
	  return {
	    clientHeight: d.scroller.clientHeight,
	    viewHeight: d.wrapper.clientHeight,
	    scrollWidth: d.scroller.scrollWidth, clientWidth: d.scroller.clientWidth,
	    viewWidth: d.wrapper.clientWidth,
	    barLeft: cm.options.fixedGutter ? gutterW : 0,
	    docHeight: docH,
	    scrollHeight: docH + scrollGap(cm) + d.barHeight,
	    nativeBarWidth: d.nativeBarWidth,
	    gutterWidth: gutterW
	  }
	}

	var NativeScrollbars = function(place, scroll, cm) {
	  this.cm = cm;
	  var vert = this.vert = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar");
	  var horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar");
	  place(vert); place(horiz);

	  on(vert, "scroll", function () {
	    if (vert.clientHeight) { scroll(vert.scrollTop, "vertical"); }
	  });
	  on(horiz, "scroll", function () {
	    if (horiz.clientWidth) { scroll(horiz.scrollLeft, "horizontal"); }
	  });

	  this.checkedZeroWidth = false;
	  // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
	  if (ie && ie_version < 8) { this.horiz.style.minHeight = this.vert.style.minWidth = "18px"; }
	};

	NativeScrollbars.prototype.update = function (measure) {
	  var needsH = measure.scrollWidth > measure.clientWidth + 1;
	  var needsV = measure.scrollHeight > measure.clientHeight + 1;
	  var sWidth = measure.nativeBarWidth;

	  if (needsV) {
	    this.vert.style.display = "block";
	    this.vert.style.bottom = needsH ? sWidth + "px" : "0";
	    var totalHeight = measure.viewHeight - (needsH ? sWidth : 0);
	    // A bug in IE8 can cause this value to be negative, so guard it.
	    this.vert.firstChild.style.height =
	      Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + "px";
	  } else {
	    this.vert.style.display = "";
	    this.vert.firstChild.style.height = "0";
	  }

	  if (needsH) {
	    this.horiz.style.display = "block";
	    this.horiz.style.right = needsV ? sWidth + "px" : "0";
	    this.horiz.style.left = measure.barLeft + "px";
	    var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0);
	    this.horiz.firstChild.style.width =
	      Math.max(0, measure.scrollWidth - measure.clientWidth + totalWidth) + "px";
	  } else {
	    this.horiz.style.display = "";
	    this.horiz.firstChild.style.width = "0";
	  }

	  if (!this.checkedZeroWidth && measure.clientHeight > 0) {
	    if (sWidth == 0) { this.zeroWidthHack(); }
	    this.checkedZeroWidth = true;
	  }

	  return {right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0}
	};

	NativeScrollbars.prototype.setScrollLeft = function (pos) {
	  if (this.horiz.scrollLeft != pos) { this.horiz.scrollLeft = pos; }
	  if (this.disableHoriz) { this.enableZeroWidthBar(this.horiz, this.disableHoriz, "horiz"); }
	};

	NativeScrollbars.prototype.setScrollTop = function (pos) {
	  if (this.vert.scrollTop != pos) { this.vert.scrollTop = pos; }
	  if (this.disableVert) { this.enableZeroWidthBar(this.vert, this.disableVert, "vert"); }
	};

	NativeScrollbars.prototype.zeroWidthHack = function () {
	  var w = mac && !mac_geMountainLion ? "12px" : "18px";
	  this.horiz.style.height = this.vert.style.width = w;
	  this.horiz.style.pointerEvents = this.vert.style.pointerEvents = "none";
	  this.disableHoriz = new Delayed;
	  this.disableVert = new Delayed;
	};

	NativeScrollbars.prototype.enableZeroWidthBar = function (bar, delay, type) {
	  bar.style.pointerEvents = "auto";
	  function maybeDisable() {
	    // To find out whether the scrollbar is still visible, we
	    // check whether the element under the pixel in the bottom
	    // right corner of the scrollbar box is the scrollbar box
	    // itself (when the bar is still visible) or its filler child
	    // (when the bar is hidden). If it is still visible, we keep
	    // it enabled, if it's hidden, we disable pointer events.
	    var box = bar.getBoundingClientRect();
	    var elt$$1 = type == "vert" ? document.elementFromPoint(box.right - 1, (box.top + box.bottom) / 2)
	        : document.elementFromPoint((box.right + box.left) / 2, box.bottom - 1);
	    if (elt$$1 != bar) { bar.style.pointerEvents = "none"; }
	    else { delay.set(1000, maybeDisable); }
	  }
	  delay.set(1000, maybeDisable);
	};

	NativeScrollbars.prototype.clear = function () {
	  var parent = this.horiz.parentNode;
	  parent.removeChild(this.horiz);
	  parent.removeChild(this.vert);
	};

	var NullScrollbars = function () {};

	NullScrollbars.prototype.update = function () { return {bottom: 0, right: 0} };
	NullScrollbars.prototype.setScrollLeft = function () {};
	NullScrollbars.prototype.setScrollTop = function () {};
	NullScrollbars.prototype.clear = function () {};

	function updateScrollbars(cm, measure) {
	  if (!measure) { measure = measureForScrollbars(cm); }
	  var startWidth = cm.display.barWidth, startHeight = cm.display.barHeight;
	  updateScrollbarsInner(cm, measure);
	  for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {
	    if (startWidth != cm.display.barWidth && cm.options.lineWrapping)
	      { updateHeightsInViewport(cm); }
	    updateScrollbarsInner(cm, measureForScrollbars(cm));
	    startWidth = cm.display.barWidth; startHeight = cm.display.barHeight;
	  }
	}

	// Re-synchronize the fake scrollbars with the actual size of the
	// content.
	function updateScrollbarsInner(cm, measure) {
	  var d = cm.display;
	  var sizes = d.scrollbars.update(measure);

	  d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px";
	  d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px";
	  d.heightForcer.style.borderBottom = sizes.bottom + "px solid transparent";

	  if (sizes.right && sizes.bottom) {
	    d.scrollbarFiller.style.display = "block";
	    d.scrollbarFiller.style.height = sizes.bottom + "px";
	    d.scrollbarFiller.style.width = sizes.right + "px";
	  } else { d.scrollbarFiller.style.display = ""; }
	  if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
	    d.gutterFiller.style.display = "block";
	    d.gutterFiller.style.height = sizes.bottom + "px";
	    d.gutterFiller.style.width = measure.gutterWidth + "px";
	  } else { d.gutterFiller.style.display = ""; }
	}

	var scrollbarModel = {"native": NativeScrollbars, "null": NullScrollbars};

	function initScrollbars(cm) {
	  if (cm.display.scrollbars) {
	    cm.display.scrollbars.clear();
	    if (cm.display.scrollbars.addClass)
	      { rmClass(cm.display.wrapper, cm.display.scrollbars.addClass); }
	  }

	  cm.display.scrollbars = new scrollbarModel[cm.options.scrollbarStyle](function (node) {
	    cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller);
	    // Prevent clicks in the scrollbars from killing focus
	    on(node, "mousedown", function () {
	      if (cm.state.focused) { setTimeout(function () { return cm.display.input.focus(); }, 0); }
	    });
	    node.setAttribute("cm-not-content", "true");
	  }, function (pos, axis) {
	    if (axis == "horizontal") { setScrollLeft(cm, pos); }
	    else { updateScrollTop(cm, pos); }
	  }, cm);
	  if (cm.display.scrollbars.addClass)
	    { addClass(cm.display.wrapper, cm.display.scrollbars.addClass); }
	}

	// Operations are used to wrap a series of changes to the editor
	// state in such a way that each change won't have to update the
	// cursor and display (which would be awkward, slow, and
	// error-prone). Instead, display updates are batched and then all
	// combined and executed at once.

	var nextOpId = 0;
	// Start a new operation.
	function startOperation(cm) {
	  cm.curOp = {
	    cm: cm,
	    viewChanged: false,      // Flag that indicates that lines might need to be redrawn
	    startHeight: cm.doc.height, // Used to detect need to update scrollbar
	    forceUpdate: false,      // Used to force a redraw
	    updateInput: null,       // Whether to reset the input textarea
	    typing: false,           // Whether this reset should be careful to leave existing text (for compositing)
	    changeObjs: null,        // Accumulated changes, for firing change events
	    cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on
	    cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already
	    selectionChanged: false, // Whether the selection needs to be redrawn
	    updateMaxLine: false,    // Set when the widest line needs to be determined anew
	    scrollLeft: null, scrollTop: null, // Intermediate scroll position, not pushed to DOM yet
	    scrollToPos: null,       // Used to scroll to a specific position
	    focus: false,
	    id: ++nextOpId           // Unique ID
	  };
	  pushOperation(cm.curOp);
	}

	// Finish an operation, updating the display and signalling delayed events
	function endOperation(cm) {
	  var op = cm.curOp;
	  finishOperation(op, function (group) {
	    for (var i = 0; i < group.ops.length; i++)
	      { group.ops[i].cm.curOp = null; }
	    endOperations(group);
	  });
	}

	// The DOM updates done when an operation finishes are batched so
	// that the minimum number of relayouts are required.
	function endOperations(group) {
	  var ops = group.ops;
	  for (var i = 0; i < ops.length; i++) // Read DOM
	    { endOperation_R1(ops[i]); }
	  for (var i$1 = 0; i$1 < ops.length; i$1++) // Write DOM (maybe)
	    { endOperation_W1(ops[i$1]); }
	  for (var i$2 = 0; i$2 < ops.length; i$2++) // Read DOM
	    { endOperation_R2(ops[i$2]); }
	  for (var i$3 = 0; i$3 < ops.length; i$3++) // Write DOM (maybe)
	    { endOperation_W2(ops[i$3]); }
	  for (var i$4 = 0; i$4 < ops.length; i$4++) // Read DOM
	    { endOperation_finish(ops[i$4]); }
	}

	function endOperation_R1(op) {
	  var cm = op.cm, display = cm.display;
	  maybeClipScrollbars(cm);
	  if (op.updateMaxLine) { findMaxLine(cm); }

	  op.mustUpdate = op.viewChanged || op.forceUpdate || op.scrollTop != null ||
	    op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom ||
	                       op.scrollToPos.to.line >= display.viewTo) ||
	    display.maxLineChanged && cm.options.lineWrapping;
	  op.update = op.mustUpdate &&
	    new DisplayUpdate(cm, op.mustUpdate && {top: op.scrollTop, ensure: op.scrollToPos}, op.forceUpdate);
	}

	function endOperation_W1(op) {
	  op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update);
	}

	function endOperation_R2(op) {
	  var cm = op.cm, display = cm.display;
	  if (op.updatedDisplay) { updateHeightsInViewport(cm); }

	  op.barMeasure = measureForScrollbars(cm);

	  // If the max line changed since it was last measured, measure it,
	  // and ensure the document's width matches it.
	  // updateDisplay_W2 will use these properties to do the actual resizing
	  if (display.maxLineChanged && !cm.options.lineWrapping) {
	    op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3;
	    cm.display.sizerWidth = op.adjustWidthTo;
	    op.barMeasure.scrollWidth =
	      Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth);
	    op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm));
	  }

	  if (op.updatedDisplay || op.selectionChanged)
	    { op.preparedSelection = display.input.prepareSelection(op.focus); }
	}

	function endOperation_W2(op) {
	  var cm = op.cm;

	  if (op.adjustWidthTo != null) {
	    cm.display.sizer.style.minWidth = op.adjustWidthTo + "px";
	    if (op.maxScrollLeft < cm.doc.scrollLeft)
	      { setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true); }
	    cm.display.maxLineChanged = false;
	  }

	  var takeFocus = op.focus && op.focus == activeElt() && (!document.hasFocus || document.hasFocus());
	  if (op.preparedSelection)
	    { cm.display.input.showSelection(op.preparedSelection, takeFocus); }
	  if (op.updatedDisplay || op.startHeight != cm.doc.height)
	    { updateScrollbars(cm, op.barMeasure); }
	  if (op.updatedDisplay)
	    { setDocumentHeight(cm, op.barMeasure); }

	  if (op.selectionChanged) { restartBlink(cm); }

	  if (cm.state.focused && op.updateInput)
	    { cm.display.input.reset(op.typing); }
	  if (takeFocus) { ensureFocus(op.cm); }
	}

	function endOperation_finish(op) {
	  var cm = op.cm, display = cm.display, doc = cm.doc;

	  if (op.updatedDisplay) { postUpdateDisplay(cm, op.update); }

	  // Abort mouse wheel delta measurement, when scrolling explicitly
	  if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos))
	    { display.wheelStartX = display.wheelStartY = null; }

	  // Propagate the scroll position to the actual DOM scroller
	  if (op.scrollTop != null) { setScrollTop(cm, op.scrollTop, op.forceScroll); }

	  if (op.scrollLeft != null) { setScrollLeft(cm, op.scrollLeft, true, true); }
	  // If we need to scroll a specific position into view, do so.
	  if (op.scrollToPos) {
	    var rect = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),
	                                 clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin);
	    maybeScrollWindow(cm, rect);
	  }

	  // Fire events for markers that are hidden/unidden by editing or
	  // undoing
	  var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers;
	  if (hidden) { for (var i = 0; i < hidden.length; ++i)
	    { if (!hidden[i].lines.length) { signal(hidden[i], "hide"); } } }
	  if (unhidden) { for (var i$1 = 0; i$1 < unhidden.length; ++i$1)
	    { if (unhidden[i$1].lines.length) { signal(unhidden[i$1], "unhide"); } } }

	  if (display.wrapper.offsetHeight)
	    { doc.scrollTop = cm.display.scroller.scrollTop; }

	  // Fire change events, and delayed event handlers
	  if (op.changeObjs)
	    { signal(cm, "changes", cm, op.changeObjs); }
	  if (op.update)
	    { op.update.finish(); }
	}

	// Run the given function in an operation
	function runInOp(cm, f) {
	  if (cm.curOp) { return f() }
	  startOperation(cm);
	  try { return f() }
	  finally { endOperation(cm); }
	}
	// Wraps a function in an operation. Returns the wrapped function.
	function operation(cm, f) {
	  return function() {
	    if (cm.curOp) { return f.apply(cm, arguments) }
	    startOperation(cm);
	    try { return f.apply(cm, arguments) }
	    finally { endOperation(cm); }
	  }
	}
	// Used to add methods to editor and doc instances, wrapping them in
	// operations.
	function methodOp(f) {
	  return function() {
	    if (this.curOp) { return f.apply(this, arguments) }
	    startOperation(this);
	    try { return f.apply(this, arguments) }
	    finally { endOperation(this); }
	  }
	}
	function docMethodOp(f) {
	  return function() {
	    var cm = this.cm;
	    if (!cm || cm.curOp) { return f.apply(this, arguments) }
	    startOperation(cm);
	    try { return f.apply(this, arguments) }
	    finally { endOperation(cm); }
	  }
	}

	// Updates the display.view data structure for a given change to the
	// document. From and to are in pre-change coordinates. Lendiff is
	// the amount of lines added or subtracted by the change. This is
	// used for changes that span multiple lines, or change the way
	// lines are divided into visual lines. regLineChange (below)
	// registers single-line changes.
	function regChange(cm, from, to, lendiff) {
	  if (from == null) { from = cm.doc.first; }
	  if (to == null) { to = cm.doc.first + cm.doc.size; }
	  if (!lendiff) { lendiff = 0; }

	  var display = cm.display;
	  if (lendiff && to < display.viewTo &&
	      (display.updateLineNumbers == null || display.updateLineNumbers > from))
	    { display.updateLineNumbers = from; }

	  cm.curOp.viewChanged = true;

	  if (from >= display.viewTo) { // Change after
	    if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo)
	      { resetView(cm); }
	  } else if (to <= display.viewFrom) { // Change before
	    if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {
	      resetView(cm);
	    } else {
	      display.viewFrom += lendiff;
	      display.viewTo += lendiff;
	    }
	  } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap
	    resetView(cm);
	  } else if (from <= display.viewFrom) { // Top overlap
	    var cut = viewCuttingPoint(cm, to, to + lendiff, 1);
	    if (cut) {
	      display.view = display.view.slice(cut.index);
	      display.viewFrom = cut.lineN;
	      display.viewTo += lendiff;
	    } else {
	      resetView(cm);
	    }
	  } else if (to >= display.viewTo) { // Bottom overlap
	    var cut$1 = viewCuttingPoint(cm, from, from, -1);
	    if (cut$1) {
	      display.view = display.view.slice(0, cut$1.index);
	      display.viewTo = cut$1.lineN;
	    } else {
	      resetView(cm);
	    }
	  } else { // Gap in the middle
	    var cutTop = viewCuttingPoint(cm, from, from, -1);
	    var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1);
	    if (cutTop && cutBot) {
	      display.view = display.view.slice(0, cutTop.index)
	        .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))
	        .concat(display.view.slice(cutBot.index));
	      display.viewTo += lendiff;
	    } else {
	      resetView(cm);
	    }
	  }

	  var ext = display.externalMeasured;
	  if (ext) {
	    if (to < ext.lineN)
	      { ext.lineN += lendiff; }
	    else if (from < ext.lineN + ext.size)
	      { display.externalMeasured = null; }
	  }
	}

	// Register a change to a single line. Type must be one of "text",
	// "gutter", "class", "widget"
	function regLineChange(cm, line, type) {
	  cm.curOp.viewChanged = true;
	  var display = cm.display, ext = cm.display.externalMeasured;
	  if (ext && line >= ext.lineN && line < ext.lineN + ext.size)
	    { display.externalMeasured = null; }

	  if (line < display.viewFrom || line >= display.viewTo) { return }
	  var lineView = display.view[findViewIndex(cm, line)];
	  if (lineView.node == null) { return }
	  var arr = lineView.changes || (lineView.changes = []);
	  if (indexOf(arr, type) == -1) { arr.push(type); }
	}

	// Clear the view.
	function resetView(cm) {
	  cm.display.viewFrom = cm.display.viewTo = cm.doc.first;
	  cm.display.view = [];
	  cm.display.viewOffset = 0;
	}

	function viewCuttingPoint(cm, oldN, newN, dir) {
	  var index = findViewIndex(cm, oldN), diff, view = cm.display.view;
	  if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size)
	    { return {index: index, lineN: newN} }
	  var n = cm.display.viewFrom;
	  for (var i = 0; i < index; i++)
	    { n += view[i].size; }
	  if (n != oldN) {
	    if (dir > 0) {
	      if (index == view.length - 1) { return null }
	      diff = (n + view[index].size) - oldN;
	      index++;
	    } else {
	      diff = n - oldN;
	    }
	    oldN += diff; newN += diff;
	  }
	  while (visualLineNo(cm.doc, newN) != newN) {
	    if (index == (dir < 0 ? 0 : view.length - 1)) { return null }
	    newN += dir * view[index - (dir < 0 ? 1 : 0)].size;
	    index += dir;
	  }
	  return {index: index, lineN: newN}
	}

	// Force the view to cover a given range, adding empty view element
	// or clipping off existing ones as needed.
	function adjustView(cm, from, to) {
	  var display = cm.display, view = display.view;
	  if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {
	    display.view = buildViewArray(cm, from, to);
	    display.viewFrom = from;
	  } else {
	    if (display.viewFrom > from)
	      { display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view); }
	    else if (display.viewFrom < from)
	      { display.view = display.view.slice(findViewIndex(cm, from)); }
	    display.viewFrom = from;
	    if (display.viewTo < to)
	      { display.view = display.view.concat(buildViewArray(cm, display.viewTo, to)); }
	    else if (display.viewTo > to)
	      { display.view = display.view.slice(0, findViewIndex(cm, to)); }
	  }
	  display.viewTo = to;
	}

	// Count the number of lines in the view whose DOM representation is
	// out of date (or nonexistent).
	function countDirtyView(cm) {
	  var view = cm.display.view, dirty = 0;
	  for (var i = 0; i < view.length; i++) {
	    var lineView = view[i];
	    if (!lineView.hidden && (!lineView.node || lineView.changes)) { ++dirty; }
	  }
	  return dirty
	}

	// HIGHLIGHT WORKER

	function startWorker(cm, time) {
	  if (cm.doc.highlightFrontier < cm.display.viewTo)
	    { cm.state.highlight.set(time, bind(highlightWorker, cm)); }
	}

	function highlightWorker(cm) {
	  var doc = cm.doc;
	  if (doc.highlightFrontier >= cm.display.viewTo) { return }
	  var end = +new Date + cm.options.workTime;
	  var context = getContextBefore(cm, doc.highlightFrontier);
	  var changedLines = [];

	  doc.iter(context.line, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function (line) {
	    if (context.line >= cm.display.viewFrom) { // Visible
	      var oldStyles = line.styles;
	      var resetState = line.text.length > cm.options.maxHighlightLength ? copyState(doc.mode, context.state) : null;
	      var highlighted = highlightLine(cm, line, context, true);
	      if (resetState) { context.state = resetState; }
	      line.styles = highlighted.styles;
	      var oldCls = line.styleClasses, newCls = highlighted.classes;
	      if (newCls) { line.styleClasses = newCls; }
	      else if (oldCls) { line.styleClasses = null; }
	      var ischange = !oldStyles || oldStyles.length != line.styles.length ||
	        oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass);
	      for (var i = 0; !ischange && i < oldStyles.length; ++i) { ischange = oldStyles[i] != line.styles[i]; }
	      if (ischange) { changedLines.push(context.line); }
	      line.stateAfter = context.save();
	      context.nextLine();
	    } else {
	      if (line.text.length <= cm.options.maxHighlightLength)
	        { processLine(cm, line.text, context); }
	      line.stateAfter = context.line % 5 == 0 ? context.save() : null;
	      context.nextLine();
	    }
	    if (+new Date > end) {
	      startWorker(cm, cm.options.workDelay);
	      return true
	    }
	  });
	  doc.highlightFrontier = context.line;
	  doc.modeFrontier = Math.max(doc.modeFrontier, context.line);
	  if (changedLines.length) { runInOp(cm, function () {
	    for (var i = 0; i < changedLines.length; i++)
	      { regLineChange(cm, changedLines[i], "text"); }
	  }); }
	}

	// DISPLAY DRAWING

	var DisplayUpdate = function(cm, viewport, force) {
	  var display = cm.display;

	  this.viewport = viewport;
	  // Store some values that we'll need later (but don't want to force a relayout for)
	  this.visible = visibleLines(display, cm.doc, viewport);
	  this.editorIsHidden = !display.wrapper.offsetWidth;
	  this.wrapperHeight = display.wrapper.clientHeight;
	  this.wrapperWidth = display.wrapper.clientWidth;
	  this.oldDisplayWidth = displayWidth(cm);
	  this.force = force;
	  this.dims = getDimensions(cm);
	  this.events = [];
	};

	DisplayUpdate.prototype.signal = function (emitter, type) {
	  if (hasHandler(emitter, type))
	    { this.events.push(arguments); }
	};
	DisplayUpdate.prototype.finish = function () {
	    var this$1 = this;

	  for (var i = 0; i < this.events.length; i++)
	    { signal.apply(null, this$1.events[i]); }
	};

	function maybeClipScrollbars(cm) {
	  var display = cm.display;
	  if (!display.scrollbarsClipped && display.scroller.offsetWidth) {
	    display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth;
	    display.heightForcer.style.height = scrollGap(cm) + "px";
	    display.sizer.style.marginBottom = -display.nativeBarWidth + "px";
	    display.sizer.style.borderRightWidth = scrollGap(cm) + "px";
	    display.scrollbarsClipped = true;
	  }
	}

	function selectionSnapshot(cm) {
	  if (cm.hasFocus()) { return null }
	  var active = activeElt();
	  if (!active || !contains(cm.display.lineDiv, active)) { return null }
	  var result = {activeElt: active};
	  if (window.getSelection) {
	    var sel = window.getSelection();
	    if (sel.anchorNode && sel.extend && contains(cm.display.lineDiv, sel.anchorNode)) {
	      result.anchorNode = sel.anchorNode;
	      result.anchorOffset = sel.anchorOffset;
	      result.focusNode = sel.focusNode;
	      result.focusOffset = sel.focusOffset;
	    }
	  }
	  return result
	}

	function restoreSelection(snapshot) {
	  if (!snapshot || !snapshot.activeElt || snapshot.activeElt == activeElt()) { return }
	  snapshot.activeElt.focus();
	  if (snapshot.anchorNode && contains(document.body, snapshot.anchorNode) && contains(document.body, snapshot.focusNode)) {
	    var sel = window.getSelection(), range$$1 = document.createRange();
	    range$$1.setEnd(snapshot.anchorNode, snapshot.anchorOffset);
	    range$$1.collapse(false);
	    sel.removeAllRanges();
	    sel.addRange(range$$1);
	    sel.extend(snapshot.focusNode, snapshot.focusOffset);
	  }
	}

	// Does the actual updating of the line display. Bails out
	// (returning false) when there is nothing to be done and forced is
	// false.
	function updateDisplayIfNeeded(cm, update) {
	  var display = cm.display, doc = cm.doc;

	  if (update.editorIsHidden) {
	    resetView(cm);
	    return false
	  }

	  // Bail out if the visible area is already rendered and nothing changed.
	  if (!update.force &&
	      update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo &&
	      (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) &&
	      display.renderedView == display.view && countDirtyView(cm) == 0)
	    { return false }

	  if (maybeUpdateLineNumberWidth(cm)) {
	    resetView(cm);
	    update.dims = getDimensions(cm);
	  }

	  // Compute a suitable new viewport (from & to)
	  var end = doc.first + doc.size;
	  var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first);
	  var to = Math.min(end, update.visible.to + cm.options.viewportMargin);
	  if (display.viewFrom < from && from - display.viewFrom < 20) { from = Math.max(doc.first, display.viewFrom); }
	  if (display.viewTo > to && display.viewTo - to < 20) { to = Math.min(end, display.viewTo); }
	  if (sawCollapsedSpans) {
	    from = visualLineNo(cm.doc, from);
	    to = visualLineEndNo(cm.doc, to);
	  }

	  var different = from != display.viewFrom || to != display.viewTo ||
	    display.lastWrapHeight != update.wrapperHeight || display.lastWrapWidth != update.wrapperWidth;
	  adjustView(cm, from, to);

	  display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom));
	  // Position the mover div to align with the current scroll position
	  cm.display.mover.style.top = display.viewOffset + "px";

	  var toUpdate = countDirtyView(cm);
	  if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view &&
	      (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo))
	    { return false }

	  // For big changes, we hide the enclosing element during the
	  // update, since that speeds up the operations on most browsers.
	  var selSnapshot = selectionSnapshot(cm);
	  if (toUpdate > 4) { display.lineDiv.style.display = "none"; }
	  patchDisplay(cm, display.updateLineNumbers, update.dims);
	  if (toUpdate > 4) { display.lineDiv.style.display = ""; }
	  display.renderedView = display.view;
	  // There might have been a widget with a focused element that got
	  // hidden or updated, if so re-focus it.
	  restoreSelection(selSnapshot);

	  // Prevent selection and cursors from interfering with the scroll
	  // width and height.
	  removeChildren(display.cursorDiv);
	  removeChildren(display.selectionDiv);
	  display.gutters.style.height = display.sizer.style.minHeight = 0;

	  if (different) {
	    display.lastWrapHeight = update.wrapperHeight;
	    display.lastWrapWidth = update.wrapperWidth;
	    startWorker(cm, 400);
	  }

	  display.updateLineNumbers = null;

	  return true
	}

	function postUpdateDisplay(cm, update) {
	  var viewport = update.viewport;

	  for (var first = true;; first = false) {
	    if (!first || !cm.options.lineWrapping || update.oldDisplayWidth == displayWidth(cm)) {
	      // Clip forced viewport to actual scrollable area.
	      if (viewport && viewport.top != null)
	        { viewport = {top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)}; }
	      // Updated line heights might result in the drawn area not
	      // actually covering the viewport. Keep looping until it does.
	      update.visible = visibleLines(cm.display, cm.doc, viewport);
	      if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo)
	        { break }
	    }
	    if (!updateDisplayIfNeeded(cm, update)) { break }
	    updateHeightsInViewport(cm);
	    var barMeasure = measureForScrollbars(cm);
	    updateSelection(cm);
	    updateScrollbars(cm, barMeasure);
	    setDocumentHeight(cm, barMeasure);
	    update.force = false;
	  }

	  update.signal(cm, "update", cm);
	  if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {
	    update.signal(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo);
	    cm.display.reportedViewFrom = cm.display.viewFrom; cm.display.reportedViewTo = cm.display.viewTo;
	  }
	}

	function updateDisplaySimple(cm, viewport) {
	  var update = new DisplayUpdate(cm, viewport);
	  if (updateDisplayIfNeeded(cm, update)) {
	    updateHeightsInViewport(cm);
	    postUpdateDisplay(cm, update);
	    var barMeasure = measureForScrollbars(cm);
	    updateSelection(cm);
	    updateScrollbars(cm, barMeasure);
	    setDocumentHeight(cm, barMeasure);
	    update.finish();
	  }
	}

	// Sync the actual display DOM structure with display.view, removing
	// nodes for lines that are no longer in view, and creating the ones
	// that are not there yet, and updating the ones that are out of
	// date.
	function patchDisplay(cm, updateNumbersFrom, dims) {
	  var display = cm.display, lineNumbers = cm.options.lineNumbers;
	  var container = display.lineDiv, cur = container.firstChild;

	  function rm(node) {
	    var next = node.nextSibling;
	    // Works around a throw-scroll bug in OS X Webkit
	    if (webkit && mac && cm.display.currentWheelTarget == node)
	      { node.style.display = "none"; }
	    else
	      { node.parentNode.removeChild(node); }
	    return next
	  }

	  var view = display.view, lineN = display.viewFrom;
	  // Loop over the elements in the view, syncing cur (the DOM nodes
	  // in display.lineDiv) with the view as we go.
	  for (var i = 0; i < view.length; i++) {
	    var lineView = view[i];
	    if (lineView.hidden) {
	    } else if (!lineView.node || lineView.node.parentNode != container) { // Not drawn yet
	      var node = buildLineElement(cm, lineView, lineN, dims);
	      container.insertBefore(node, cur);
	    } else { // Already drawn
	      while (cur != lineView.node) { cur = rm(cur); }
	      var updateNumber = lineNumbers && updateNumbersFrom != null &&
	        updateNumbersFrom <= lineN && lineView.lineNumber;
	      if (lineView.changes) {
	        if (indexOf(lineView.changes, "gutter") > -1) { updateNumber = false; }
	        updateLineForChanges(cm, lineView, lineN, dims);
	      }
	      if (updateNumber) {
	        removeChildren(lineView.lineNumber);
	        lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)));
	      }
	      cur = lineView.node.nextSibling;
	    }
	    lineN += lineView.size;
	  }
	  while (cur) { cur = rm(cur); }
	}

	function updateGutterSpace(cm) {
	  var width = cm.display.gutters.offsetWidth;
	  cm.display.sizer.style.marginLeft = width + "px";
	}

	function setDocumentHeight(cm, measure) {
	  cm.display.sizer.style.minHeight = measure.docHeight + "px";
	  cm.display.heightForcer.style.top = measure.docHeight + "px";
	  cm.display.gutters.style.height = (measure.docHeight + cm.display.barHeight + scrollGap(cm)) + "px";
	}

	// Rebuild the gutter elements, ensure the margin to the left of the
	// code matches their width.
	function updateGutters(cm) {
	  var gutters = cm.display.gutters, specs = cm.options.gutters;
	  removeChildren(gutters);
	  var i = 0;
	  for (; i < specs.length; ++i) {
	    var gutterClass = specs[i];
	    var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + gutterClass));
	    if (gutterClass == "CodeMirror-linenumbers") {
	      cm.display.lineGutter = gElt;
	      gElt.style.width = (cm.display.lineNumWidth || 1) + "px";
	    }
	  }
	  gutters.style.display = i ? "" : "none";
	  updateGutterSpace(cm);
	}

	// Make sure the gutters options contains the element
	// "CodeMirror-linenumbers" when the lineNumbers option is true.
	function setGuttersForLineNumbers(options) {
	  var found = indexOf(options.gutters, "CodeMirror-linenumbers");
	  if (found == -1 && options.lineNumbers) {
	    options.gutters = options.gutters.concat(["CodeMirror-linenumbers"]);
	  } else if (found > -1 && !options.lineNumbers) {
	    options.gutters = options.gutters.slice(0);
	    options.gutters.splice(found, 1);
	  }
	}

	// Since the delta values reported on mouse wheel events are
	// unstandardized between browsers and even browser versions, and
	// generally horribly unpredictable, this code starts by measuring
	// the scroll effect that the first few mouse wheel events have,
	// and, from that, detects the way it can convert deltas to pixel
	// offsets afterwards.
	//
	// The reason we want to know the amount a wheel event will scroll
	// is that it gives us a chance to update the display before the
	// actual scrolling happens, reducing flickering.

	var wheelSamples = 0;
	var wheelPixelsPerUnit = null;
	// Fill in a browser-detected starting value on browsers where we
	// know one. These don't have to be accurate -- the result of them
	// being wrong would just be a slight flicker on the first wheel
	// scroll (if it is large enough).
	if (ie) { wheelPixelsPerUnit = -.53; }
	else if (gecko) { wheelPixelsPerUnit = 15; }
	else if (chrome) { wheelPixelsPerUnit = -.7; }
	else if (safari) { wheelPixelsPerUnit = -1/3; }

	function wheelEventDelta(e) {
	  var dx = e.wheelDeltaX, dy = e.wheelDeltaY;
	  if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) { dx = e.detail; }
	  if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) { dy = e.detail; }
	  else if (dy == null) { dy = e.wheelDelta; }
	  return {x: dx, y: dy}
	}
	function wheelEventPixels(e) {
	  var delta = wheelEventDelta(e);
	  delta.x *= wheelPixelsPerUnit;
	  delta.y *= wheelPixelsPerUnit;
	  return delta
	}

	function onScrollWheel(cm, e) {
	  var delta = wheelEventDelta(e), dx = delta.x, dy = delta.y;

	  var display = cm.display, scroll = display.scroller;
	  // Quit if there's nothing to scroll here
	  var canScrollX = scroll.scrollWidth > scroll.clientWidth;
	  var canScrollY = scroll.scrollHeight > scroll.clientHeight;
	  if (!(dx && canScrollX || dy && canScrollY)) { return }

	  // Webkit browsers on OS X abort momentum scrolls when the target
	  // of the scroll event is removed from the scrollable element.
	  // This hack (see related code in patchDisplay) makes sure the
	  // element is kept around.
	  if (dy && mac && webkit) {
	    outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {
	      for (var i = 0; i < view.length; i++) {
	        if (view[i].node == cur) {
	          cm.display.currentWheelTarget = cur;
	          break outer
	        }
	      }
	    }
	  }

	  // On some browsers, horizontal scrolling will cause redraws to
	  // happen before the gutter has been realigned, causing it to
	  // wriggle around in a most unseemly way. When we have an
	  // estimated pixels/delta value, we just handle horizontal
	  // scrolling entirely here. It'll be slightly off from native, but
	  // better than glitching out.
	  if (dx && !gecko && !presto && wheelPixelsPerUnit != null) {
	    if (dy && canScrollY)
	      { updateScrollTop(cm, Math.max(0, scroll.scrollTop + dy * wheelPixelsPerUnit)); }
	    setScrollLeft(cm, Math.max(0, scroll.scrollLeft + dx * wheelPixelsPerUnit));
	    // Only prevent default scrolling if vertical scrolling is
	    // actually possible. Otherwise, it causes vertical scroll
	    // jitter on OSX trackpads when deltaX is small and deltaY
	    // is large (issue #3579)
	    if (!dy || (dy && canScrollY))
	      { e_preventDefault(e); }
	    display.wheelStartX = null; // Abort measurement, if in progress
	    return
	  }

	  // 'Project' the visible viewport to cover the area that is being
	  // scrolled into view (if we know enough to estimate it).
	  if (dy && wheelPixelsPerUnit != null) {
	    var pixels = dy * wheelPixelsPerUnit;
	    var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight;
	    if (pixels < 0) { top = Math.max(0, top + pixels - 50); }
	    else { bot = Math.min(cm.doc.height, bot + pixels + 50); }
	    updateDisplaySimple(cm, {top: top, bottom: bot});
	  }

	  if (wheelSamples < 20) {
	    if (display.wheelStartX == null) {
	      display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop;
	      display.wheelDX = dx; display.wheelDY = dy;
	      setTimeout(function () {
	        if (display.wheelStartX == null) { return }
	        var movedX = scroll.scrollLeft - display.wheelStartX;
	        var movedY = scroll.scrollTop - display.wheelStartY;
	        var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||
	          (movedX && display.wheelDX && movedX / display.wheelDX);
	        display.wheelStartX = display.wheelStartY = null;
	        if (!sample) { return }
	        wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);
	        ++wheelSamples;
	      }, 200);
	    } else {
	      display.wheelDX += dx; display.wheelDY += dy;
	    }
	  }
	}

	// Selection objects are immutable. A new one is created every time
	// the selection changes. A selection is one or more non-overlapping
	// (and non-touching) ranges, sorted, and an integer that indicates
	// which one is the primary selection (the one that's scrolled into
	// view, that getCursor returns, etc).
	var Selection = function(ranges, primIndex) {
	  this.ranges = ranges;
	  this.primIndex = primIndex;
	};

	Selection.prototype.primary = function () { return this.ranges[this.primIndex] };

	Selection.prototype.equals = function (other) {
	    var this$1 = this;

	  if (other == this) { return true }
	  if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) { return false }
	  for (var i = 0; i < this.ranges.length; i++) {
	    var here = this$1.ranges[i], there = other.ranges[i];
	    if (!equalCursorPos(here.anchor, there.anchor) || !equalCursorPos(here.head, there.head)) { return false }
	  }
	  return true
	};

	Selection.prototype.deepCopy = function () {
	    var this$1 = this;

	  var out = [];
	  for (var i = 0; i < this.ranges.length; i++)
	    { out[i] = new Range(copyPos(this$1.ranges[i].anchor), copyPos(this$1.ranges[i].head)); }
	  return new Selection(out, this.primIndex)
	};

	Selection.prototype.somethingSelected = function () {
	    var this$1 = this;

	  for (var i = 0; i < this.ranges.length; i++)
	    { if (!this$1.ranges[i].empty()) { return true } }
	  return false
	};

	Selection.prototype.contains = function (pos, end) {
	    var this$1 = this;

	  if (!end) { end = pos; }
	  for (var i = 0; i < this.ranges.length; i++) {
	    var range = this$1.ranges[i];
	    if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0)
	      { return i }
	  }
	  return -1
	};

	var Range = function(anchor, head) {
	  this.anchor = anchor; this.head = head;
	};

	Range.prototype.from = function () { return minPos(this.anchor, this.head) };
	Range.prototype.to = function () { return maxPos(this.anchor, this.head) };
	Range.prototype.empty = function () { return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch };

	// Take an unsorted, potentially overlapping set of ranges, and
	// build a selection out of it. 'Consumes' ranges array (modifying
	// it).
	function normalizeSelection(ranges, primIndex) {
	  var prim = ranges[primIndex];
	  ranges.sort(function (a, b) { return cmp(a.from(), b.from()); });
	  primIndex = indexOf(ranges, prim);
	  for (var i = 1; i < ranges.length; i++) {
	    var cur = ranges[i], prev = ranges[i - 1];
	    if (cmp(prev.to(), cur.from()) >= 0) {
	      var from = minPos(prev.from(), cur.from()), to = maxPos(prev.to(), cur.to());
	      var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head;
	      if (i <= primIndex) { --primIndex; }
	      ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to));
	    }
	  }
	  return new Selection(ranges, primIndex)
	}

	function simpleSelection(anchor, head) {
	  return new Selection([new Range(anchor, head || anchor)], 0)
	}

	// Compute the position of the end of a change (its 'to' property
	// refers to the pre-change end).
	function changeEnd(change) {
	  if (!change.text) { return change.to }
	  return Pos(change.from.line + change.text.length - 1,
	             lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0))
	}

	// Adjust a position to refer to the post-change position of the
	// same text, or the end of the change if the change covers it.
	function adjustForChange(pos, change) {
	  if (cmp(pos, change.from) < 0) { return pos }
	  if (cmp(pos, change.to) <= 0) { return changeEnd(change) }

	  var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch;
	  if (pos.line == change.to.line) { ch += changeEnd(change).ch - change.to.ch; }
	  return Pos(line, ch)
	}

	function computeSelAfterChange(doc, change) {
	  var out = [];
	  for (var i = 0; i < doc.sel.ranges.length; i++) {
	    var range = doc.sel.ranges[i];
	    out.push(new Range(adjustForChange(range.anchor, change),
	                       adjustForChange(range.head, change)));
	  }
	  return normalizeSelection(out, doc.sel.primIndex)
	}

	function offsetPos(pos, old, nw) {
	  if (pos.line == old.line)
	    { return Pos(nw.line, pos.ch - old.ch + nw.ch) }
	  else
	    { return Pos(nw.line + (pos.line - old.line), pos.ch) }
	}

	// Used by replaceSelections to allow moving the selection to the
	// start or around the replaced test. Hint may be "start" or "around".
	function computeReplacedSel(doc, changes, hint) {
	  var out = [];
	  var oldPrev = Pos(doc.first, 0), newPrev = oldPrev;
	  for (var i = 0; i < changes.length; i++) {
	    var change = changes[i];
	    var from = offsetPos(change.from, oldPrev, newPrev);
	    var to = offsetPos(changeEnd(change), oldPrev, newPrev);
	    oldPrev = change.to;
	    newPrev = to;
	    if (hint == "around") {
	      var range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0;
	      out[i] = new Range(inv ? to : from, inv ? from : to);
	    } else {
	      out[i] = new Range(from, from);
	    }
	  }
	  return new Selection(out, doc.sel.primIndex)
	}

	// Used to get the editor into a consistent state again when options change.

	function loadMode(cm) {
	  cm.doc.mode = getMode(cm.options, cm.doc.modeOption);
	  resetModeState(cm);
	}

	function resetModeState(cm) {
	  cm.doc.iter(function (line) {
	    if (line.stateAfter) { line.stateAfter = null; }
	    if (line.styles) { line.styles = null; }
	  });
	  cm.doc.modeFrontier = cm.doc.highlightFrontier = cm.doc.first;
	  startWorker(cm, 100);
	  cm.state.modeGen++;
	  if (cm.curOp) { regChange(cm); }
	}

	// DOCUMENT DATA STRUCTURE

	// By default, updates that start and end at the beginning of a line
	// are treated specially, in order to make the association of line
	// widgets and marker elements with the text behave more intuitive.
	function isWholeLineUpdate(doc, change) {
	  return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" &&
	    (!doc.cm || doc.cm.options.wholeLineUpdateBefore)
	}

	// Perform a change on the document data structure.
	function updateDoc(doc, change, markedSpans, estimateHeight$$1) {
	  function spansFor(n) {return markedSpans ? markedSpans[n] : null}
	  function update(line, text, spans) {
	    updateLine(line, text, spans, estimateHeight$$1);
	    signalLater(line, "change", line, change);
	  }
	  function linesFor(start, end) {
	    var result = [];
	    for (var i = start; i < end; ++i)
	      { result.push(new Line(text[i], spansFor(i), estimateHeight$$1)); }
	    return result
	  }

	  var from = change.from, to = change.to, text = change.text;
	  var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line);
	  var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line;

	  // Adjust the line structure
	  if (change.full) {
	    doc.insert(0, linesFor(0, text.length));
	    doc.remove(text.length, doc.size - text.length);
	  } else if (isWholeLineUpdate(doc, change)) {
	    // This is a whole-line replace. Treated specially to make
	    // sure line objects move the way they are supposed to.
	    var added = linesFor(0, text.length - 1);
	    update(lastLine, lastLine.text, lastSpans);
	    if (nlines) { doc.remove(from.line, nlines); }
	    if (added.length) { doc.insert(from.line, added); }
	  } else if (firstLine == lastLine) {
	    if (text.length == 1) {
	      update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);
	    } else {
	      var added$1 = linesFor(1, text.length - 1);
	      added$1.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight$$1));
	      update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
	      doc.insert(from.line + 1, added$1);
	    }
	  } else if (text.length == 1) {
	    update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));
	    doc.remove(from.line + 1, nlines);
	  } else {
	    update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
	    update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);
	    var added$2 = linesFor(1, text.length - 1);
	    if (nlines > 1) { doc.remove(from.line + 1, nlines - 1); }
	    doc.insert(from.line + 1, added$2);
	  }

	  signalLater(doc, "change", doc, change);
	}

	// Call f for all linked documents.
	function linkedDocs(doc, f, sharedHistOnly) {
	  function propagate(doc, skip, sharedHist) {
	    if (doc.linked) { for (var i = 0; i < doc.linked.length; ++i) {
	      var rel = doc.linked[i];
	      if (rel.doc == skip) { continue }
	      var shared = sharedHist && rel.sharedHist;
	      if (sharedHistOnly && !shared) { continue }
	      f(rel.doc, shared);
	      propagate(rel.doc, doc, shared);
	    } }
	  }
	  propagate(doc, null, true);
	}

	// Attach a document to an editor.
	function attachDoc(cm, doc) {
	  if (doc.cm) { throw new Error("This document is already in use.") }
	  cm.doc = doc;
	  doc.cm = cm;
	  estimateLineHeights(cm);
	  loadMode(cm);
	  setDirectionClass(cm);
	  if (!cm.options.lineWrapping) { findMaxLine(cm); }
	  cm.options.mode = doc.modeOption;
	  regChange(cm);
	}

	function setDirectionClass(cm) {
	  (cm.doc.direction == "rtl" ? addClass : rmClass)(cm.display.lineDiv, "CodeMirror-rtl");
	}

	function directionChanged(cm) {
	  runInOp(cm, function () {
	    setDirectionClass(cm);
	    regChange(cm);
	  });
	}

	function History(startGen) {
	  // Arrays of change events and selections. Doing something adds an
	  // event to done and clears undo. Undoing moves events from done
	  // to undone, redoing moves them in the other direction.
	  this.done = []; this.undone = [];
	  this.undoDepth = Infinity;
	  // Used to track when changes can be merged into a single undo
	  // event
	  this.lastModTime = this.lastSelTime = 0;
	  this.lastOp = this.lastSelOp = null;
	  this.lastOrigin = this.lastSelOrigin = null;
	  // Used by the isClean() method
	  this.generation = this.maxGeneration = startGen || 1;
	}

	// Create a history change event from an updateDoc-style change
	// object.
	function historyChangeFromChange(doc, change) {
	  var histChange = {from: copyPos(change.from), to: changeEnd(change), text: getBetween(doc, change.from, change.to)};
	  attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
	  linkedDocs(doc, function (doc) { return attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1); }, true);
	  return histChange
	}

	// Pop all selection events off the end of a history array. Stop at
	// a change event.
	function clearSelectionEvents(array) {
	  while (array.length) {
	    var last = lst(array);
	    if (last.ranges) { array.pop(); }
	    else { break }
	  }
	}

	// Find the top change event in the history. Pop off selection
	// events that are in the way.
	function lastChangeEvent(hist, force) {
	  if (force) {
	    clearSelectionEvents(hist.done);
	    return lst(hist.done)
	  } else if (hist.done.length && !lst(hist.done).ranges) {
	    return lst(hist.done)
	  } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
	    hist.done.pop();
	    return lst(hist.done)
	  }
	}

	// Register a change in the history. Merges changes that are within
	// a single operation, or are close together with an origin that
	// allows merging (starting with "+") into a single event.
	function addChangeToHistory(doc, change, selAfter, opId) {
	  var hist = doc.history;
	  hist.undone.length = 0;
	  var time = +new Date, cur;
	  var last;

	  if ((hist.lastOp == opId ||
	       hist.lastOrigin == change.origin && change.origin &&
	       ((change.origin.charAt(0) == "+" && doc.cm && hist.lastModTime > time - doc.cm.options.historyEventDelay) ||
	        change.origin.charAt(0) == "*")) &&
	      (cur = lastChangeEvent(hist, hist.lastOp == opId))) {
	    // Merge this change into the last event
	    last = lst(cur.changes);
	    if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
	      // Optimized case for simple insertion -- don't want to add
	      // new changesets for every character typed
	      last.to = changeEnd(change);
	    } else {
	      // Add new sub-event
	      cur.changes.push(historyChangeFromChange(doc, change));
	    }
	  } else {
	    // Can not be merged, start a new event.
	    var before = lst(hist.done);
	    if (!before || !before.ranges)
	      { pushSelectionToHistory(doc.sel, hist.done); }
	    cur = {changes: [historyChangeFromChange(doc, change)],
	           generation: hist.generation};
	    hist.done.push(cur);
	    while (hist.done.length > hist.undoDepth) {
	      hist.done.shift();
	      if (!hist.done[0].ranges) { hist.done.shift(); }
	    }
	  }
	  hist.done.push(selAfter);
	  hist.generation = ++hist.maxGeneration;
	  hist.lastModTime = hist.lastSelTime = time;
	  hist.lastOp = hist.lastSelOp = opId;
	  hist.lastOrigin = hist.lastSelOrigin = change.origin;

	  if (!last) { signal(doc, "historyAdded"); }
	}

	function selectionEventCanBeMerged(doc, origin, prev, sel) {
	  var ch = origin.charAt(0);
	  return ch == "*" ||
	    ch == "+" &&
	    prev.ranges.length == sel.ranges.length &&
	    prev.somethingSelected() == sel.somethingSelected() &&
	    new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500)
	}

	// Called whenever the selection changes, sets the new selection as
	// the pending selection in the history, and pushes the old pending
	// selection into the 'done' array when it was significantly
	// different (in number of selected ranges, emptiness, or time).
	function addSelectionToHistory(doc, sel, opId, options) {
	  var hist = doc.history, origin = options && options.origin;

	  // A new event is started when the previous origin does not match
	  // the current, or the origins don't allow matching. Origins
	  // starting with * are always merged, those starting with + are
	  // merged when similar and close together in time.
	  if (opId == hist.lastSelOp ||
	      (origin && hist.lastSelOrigin == origin &&
	       (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||
	        selectionEventCanBeMerged(doc, origin, lst(hist.done), sel))))
	    { hist.done[hist.done.length - 1] = sel; }
	  else
	    { pushSelectionToHistory(sel, hist.done); }

	  hist.lastSelTime = +new Date;
	  hist.lastSelOrigin = origin;
	  hist.lastSelOp = opId;
	  if (options && options.clearRedo !== false)
	    { clearSelectionEvents(hist.undone); }
	}

	function pushSelectionToHistory(sel, dest) {
	  var top = lst(dest);
	  if (!(top && top.ranges && top.equals(sel)))
	    { dest.push(sel); }
	}

	// Used to store marked span information in the history.
	function attachLocalSpans(doc, change, from, to) {
	  var existing = change["spans_" + doc.id], n = 0;
	  doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function (line) {
	    if (line.markedSpans)
	      { (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans; }
	    ++n;
	  });
	}

	// When un/re-doing restores text containing marked spans, those
	// that have been explicitly cleared should not be restored.
	function removeClearedSpans(spans) {
	  if (!spans) { return null }
	  var out;
	  for (var i = 0; i < spans.length; ++i) {
	    if (spans[i].marker.explicitlyCleared) { if (!out) { out = spans.slice(0, i); } }
	    else if (out) { out.push(spans[i]); }
	  }
	  return !out ? spans : out.length ? out : null
	}

	// Retrieve and filter the old marked spans stored in a change event.
	function getOldSpans(doc, change) {
	  var found = change["spans_" + doc.id];
	  if (!found) { return null }
	  var nw = [];
	  for (var i = 0; i < change.text.length; ++i)
	    { nw.push(removeClearedSpans(found[i])); }
	  return nw
	}

	// Used for un/re-doing changes from the history. Combines the
	// result of computing the existing spans with the set of spans that
	// existed in the history (so that deleting around a span and then
	// undoing brings back the span).
	function mergeOldSpans(doc, change) {
	  var old = getOldSpans(doc, change);
	  var stretched = stretchSpansOverChange(doc, change);
	  if (!old) { return stretched }
	  if (!stretched) { return old }

	  for (var i = 0; i < old.length; ++i) {
	    var oldCur = old[i], stretchCur = stretched[i];
	    if (oldCur && stretchCur) {
	      spans: for (var j = 0; j < stretchCur.length; ++j) {
	        var span = stretchCur[j];
	        for (var k = 0; k < oldCur.length; ++k)
	          { if (oldCur[k].marker == span.marker) { continue spans } }
	        oldCur.push(span);
	      }
	    } else if (stretchCur) {
	      old[i] = stretchCur;
	    }
	  }
	  return old
	}

	// Used both to provide a JSON-safe object in .getHistory, and, when
	// detaching a document, to split the history in two
	function copyHistoryArray(events, newGroup, instantiateSel) {
	  var copy = [];
	  for (var i = 0; i < events.length; ++i) {
	    var event = events[i];
	    if (event.ranges) {
	      copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event);
	      continue
	    }
	    var changes = event.changes, newChanges = [];
	    copy.push({changes: newChanges});
	    for (var j = 0; j < changes.length; ++j) {
	      var change = changes[j], m = (void 0);
	      newChanges.push({from: change.from, to: change.to, text: change.text});
	      if (newGroup) { for (var prop in change) { if (m = prop.match(/^spans_(\d+)$/)) {
	        if (indexOf(newGroup, Number(m[1])) > -1) {
	          lst(newChanges)[prop] = change[prop];
	          delete change[prop];
	        }
	      } } }
	    }
	  }
	  return copy
	}

	// The 'scroll' parameter given to many of these indicated whether
	// the new cursor position should be scrolled into view after
	// modifying the selection.

	// If shift is held or the extend flag is set, extends a range to
	// include a given position (and optionally a second position).
	// Otherwise, simply returns the range between the given positions.
	// Used for cursor motion and such.
	function extendRange(range, head, other, extend) {
	  if (extend) {
	    var anchor = range.anchor;
	    if (other) {
	      var posBefore = cmp(head, anchor) < 0;
	      if (posBefore != (cmp(other, anchor) < 0)) {
	        anchor = head;
	        head = other;
	      } else if (posBefore != (cmp(head, other) < 0)) {
	        head = other;
	      }
	    }
	    return new Range(anchor, head)
	  } else {
	    return new Range(other || head, head)
	  }
	}

	// Extend the primary selection range, discard the rest.
	function extendSelection(doc, head, other, options, extend) {
	  if (extend == null) { extend = doc.cm && (doc.cm.display.shift || doc.extend); }
	  setSelection(doc, new Selection([extendRange(doc.sel.primary(), head, other, extend)], 0), options);
	}

	// Extend all selections (pos is an array of selections with length
	// equal the number of selections)
	function extendSelections(doc, heads, options) {
	  var out = [];
	  var extend = doc.cm && (doc.cm.display.shift || doc.extend);
	  for (var i = 0; i < doc.sel.ranges.length; i++)
	    { out[i] = extendRange(doc.sel.ranges[i], heads[i], null, extend); }
	  var newSel = normalizeSelection(out, doc.sel.primIndex);
	  setSelection(doc, newSel, options);
	}

	// Updates a single range in the selection.
	function replaceOneSelection(doc, i, range, options) {
	  var ranges = doc.sel.ranges.slice(0);
	  ranges[i] = range;
	  setSelection(doc, normalizeSelection(ranges, doc.sel.primIndex), options);
	}

	// Reset the selection to a single range.
	function setSimpleSelection(doc, anchor, head, options) {
	  setSelection(doc, simpleSelection(anchor, head), options);
	}

	// Give beforeSelectionChange handlers a change to influence a
	// selection update.
	function filterSelectionChange(doc, sel, options) {
	  var obj = {
	    ranges: sel.ranges,
	    update: function(ranges) {
	      var this$1 = this;

	      this.ranges = [];
	      for (var i = 0; i < ranges.length; i++)
	        { this$1.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),
	                                   clipPos(doc, ranges[i].head)); }
	    },
	    origin: options && options.origin
	  };
	  signal(doc, "beforeSelectionChange", doc, obj);
	  if (doc.cm) { signal(doc.cm, "beforeSelectionChange", doc.cm, obj); }
	  if (obj.ranges != sel.ranges) { return normalizeSelection(obj.ranges, obj.ranges.length - 1) }
	  else { return sel }
	}

	function setSelectionReplaceHistory(doc, sel, options) {
	  var done = doc.history.done, last = lst(done);
	  if (last && last.ranges) {
	    done[done.length - 1] = sel;
	    setSelectionNoUndo(doc, sel, options);
	  } else {
	    setSelection(doc, sel, options);
	  }
	}

	// Set a new selection.
	function setSelection(doc, sel, options) {
	  setSelectionNoUndo(doc, sel, options);
	  addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options);
	}

	function setSelectionNoUndo(doc, sel, options) {
	  if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange"))
	    { sel = filterSelectionChange(doc, sel, options); }

	  var bias = options && options.bias ||
	    (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1);
	  setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));

	  if (!(options && options.scroll === false) && doc.cm)
	    { ensureCursorVisible(doc.cm); }
	}

	function setSelectionInner(doc, sel) {
	  if (sel.equals(doc.sel)) { return }

	  doc.sel = sel;

	  if (doc.cm) {
	    doc.cm.curOp.updateInput = doc.cm.curOp.selectionChanged = true;
	    signalCursorActivity(doc.cm);
	  }
	  signalLater(doc, "cursorActivity", doc);
	}

	// Verify that the selection does not partially select any atomic
	// marked ranges.
	function reCheckSelection(doc) {
	  setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false));
	}

	// Return a selection that does not partially select any atomic
	// ranges.
	function skipAtomicInSelection(doc, sel, bias, mayClear) {
	  var out;
	  for (var i = 0; i < sel.ranges.length; i++) {
	    var range = sel.ranges[i];
	    var old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i];
	    var newAnchor = skipAtomic(doc, range.anchor, old && old.anchor, bias, mayClear);
	    var newHead = skipAtomic(doc, range.head, old && old.head, bias, mayClear);
	    if (out || newAnchor != range.anchor || newHead != range.head) {
	      if (!out) { out = sel.ranges.slice(0, i); }
	      out[i] = new Range(newAnchor, newHead);
	    }
	  }
	  return out ? normalizeSelection(out, sel.primIndex) : sel
	}

	function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {
	  var line = getLine(doc, pos.line);
	  if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {
	    var sp = line.markedSpans[i], m = sp.marker;
	    if ((sp.from == null || (m.inclusiveLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&
	        (sp.to == null || (m.inclusiveRight ? sp.to >= pos.ch : sp.to > pos.ch))) {
	      if (mayClear) {
	        signal(m, "beforeCursorEnter");
	        if (m.explicitlyCleared) {
	          if (!line.markedSpans) { break }
	          else {--i; continue}
	        }
	      }
	      if (!m.atomic) { continue }

	      if (oldPos) {
	        var near = m.find(dir < 0 ? 1 : -1), diff = (void 0);
	        if (dir < 0 ? m.inclusiveRight : m.inclusiveLeft)
	          { near = movePos(doc, near, -dir, near && near.line == pos.line ? line : null); }
	        if (near && near.line == pos.line && (diff = cmp(near, oldPos)) && (dir < 0 ? diff < 0 : diff > 0))
	          { return skipAtomicInner(doc, near, pos, dir, mayClear) }
	      }

	      var far = m.find(dir < 0 ? -1 : 1);
	      if (dir < 0 ? m.inclusiveLeft : m.inclusiveRight)
	        { far = movePos(doc, far, dir, far.line == pos.line ? line : null); }
	      return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null
	    }
	  } }
	  return pos
	}

	// Ensure a given position is not inside an atomic range.
	function skipAtomic(doc, pos, oldPos, bias, mayClear) {
	  var dir = bias || 1;
	  var found = skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||
	      (!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||
	      skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||
	      (!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true));
	  if (!found) {
	    doc.cantEdit = true;
	    return Pos(doc.first, 0)
	  }
	  return found
	}

	function movePos(doc, pos, dir, line) {
	  if (dir < 0 && pos.ch == 0) {
	    if (pos.line > doc.first) { return clipPos(doc, Pos(pos.line - 1)) }
	    else { return null }
	  } else if (dir > 0 && pos.ch == (line || getLine(doc, pos.line)).text.length) {
	    if (pos.line < doc.first + doc.size - 1) { return Pos(pos.line + 1, 0) }
	    else { return null }
	  } else {
	    return new Pos(pos.line, pos.ch + dir)
	  }
	}

	function selectAll(cm) {
	  cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll);
	}

	// UPDATING

	// Allow "beforeChange" event handlers to influence a change
	function filterChange(doc, change, update) {
	  var obj = {
	    canceled: false,
	    from: change.from,
	    to: change.to,
	    text: change.text,
	    origin: change.origin,
	    cancel: function () { return obj.canceled = true; }
	  };
	  if (update) { obj.update = function (from, to, text, origin) {
	    if (from) { obj.from = clipPos(doc, from); }
	    if (to) { obj.to = clipPos(doc, to); }
	    if (text) { obj.text = text; }
	    if (origin !== undefined) { obj.origin = origin; }
	  }; }
	  signal(doc, "beforeChange", doc, obj);
	  if (doc.cm) { signal(doc.cm, "beforeChange", doc.cm, obj); }

	  if (obj.canceled) { return null }
	  return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin}
	}

	// Apply a change to a document, and add it to the document's
	// history, and propagating it to all linked documents.
	function makeChange(doc, change, ignoreReadOnly) {
	  if (doc.cm) {
	    if (!doc.cm.curOp) { return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly) }
	    if (doc.cm.state.suppressEdits) { return }
	  }

	  if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
	    change = filterChange(doc, change, true);
	    if (!change) { return }
	  }

	  // Possibly split or suppress the update based on the presence
	  // of read-only spans in its range.
	  var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);
	  if (split) {
	    for (var i = split.length - 1; i >= 0; --i)
	      { makeChangeInner(doc, {from: split[i].from, to: split[i].to, text: i ? [""] : change.text}); }
	  } else {
	    makeChangeInner(doc, change);
	  }
	}

	function makeChangeInner(doc, change) {
	  if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) { return }
	  var selAfter = computeSelAfterChange(doc, change);
	  addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);

	  makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));
	  var rebased = [];

	  linkedDocs(doc, function (doc, sharedHist) {
	    if (!sharedHist && indexOf(rebased, doc.history) == -1) {
	      rebaseHist(doc.history, change);
	      rebased.push(doc.history);
	    }
	    makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));
	  });
	}

	// Revert a change stored in a document's history.
	function makeChangeFromHistory(doc, type, allowSelectionOnly) {
	  if (doc.cm && doc.cm.state.suppressEdits && !allowSelectionOnly) { return }

	  var hist = doc.history, event, selAfter = doc.sel;
	  var source = type == "undo" ? hist.done : hist.undone, dest = type == "undo" ? hist.undone : hist.done;

	  // Verify that there is a useable event (so that ctrl-z won't
	  // needlessly clear selection events)
	  var i = 0;
	  for (; i < source.length; i++) {
	    event = source[i];
	    if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges)
	      { break }
	  }
	  if (i == source.length) { return }
	  hist.lastOrigin = hist.lastSelOrigin = null;

	  for (;;) {
	    event = source.pop();
	    if (event.ranges) {
	      pushSelectionToHistory(event, dest);
	      if (allowSelectionOnly && !event.equals(doc.sel)) {
	        setSelection(doc, event, {clearRedo: false});
	        return
	      }
	      selAfter = event;
	    }
	    else { break }
	  }

	  // Build up a reverse change object to add to the opposite history
	  // stack (redo when undoing, and vice versa).
	  var antiChanges = [];
	  pushSelectionToHistory(selAfter, dest);
	  dest.push({changes: antiChanges, generation: hist.generation});
	  hist.generation = event.generation || ++hist.maxGeneration;

	  var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange");

	  var loop = function ( i ) {
	    var change = event.changes[i];
	    change.origin = type;
	    if (filter && !filterChange(doc, change, false)) {
	      source.length = 0;
	      return {}
	    }

	    antiChanges.push(historyChangeFromChange(doc, change));

	    var after = i ? computeSelAfterChange(doc, change) : lst(source);
	    makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
	    if (!i && doc.cm) { doc.cm.scrollIntoView({from: change.from, to: changeEnd(change)}); }
	    var rebased = [];

	    // Propagate to the linked documents
	    linkedDocs(doc, function (doc, sharedHist) {
	      if (!sharedHist && indexOf(rebased, doc.history) == -1) {
	        rebaseHist(doc.history, change);
	        rebased.push(doc.history);
	      }
	      makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));
	    });
	  };

	  for (var i$1 = event.changes.length - 1; i$1 >= 0; --i$1) {
	    var returned = loop( i$1 );

	    if ( returned ) return returned.v;
	  }
	}

	// Sub-views need their line numbers shifted when text is added
	// above or below them in the parent document.
	function shiftDoc(doc, distance) {
	  if (distance == 0) { return }
	  doc.first += distance;
	  doc.sel = new Selection(map(doc.sel.ranges, function (range) { return new Range(
	    Pos(range.anchor.line + distance, range.anchor.ch),
	    Pos(range.head.line + distance, range.head.ch)
	  ); }), doc.sel.primIndex);
	  if (doc.cm) {
	    regChange(doc.cm, doc.first, doc.first - distance, distance);
	    for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++)
	      { regLineChange(doc.cm, l, "gutter"); }
	  }
	}

	// More lower-level change function, handling only a single document
	// (not linked ones).
	function makeChangeSingleDoc(doc, change, selAfter, spans) {
	  if (doc.cm && !doc.cm.curOp)
	    { return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans) }

	  if (change.to.line < doc.first) {
	    shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));
	    return
	  }
	  if (change.from.line > doc.lastLine()) { return }

	  // Clip the change to the size of this doc
	  if (change.from.line < doc.first) {
	    var shift = change.text.length - 1 - (doc.first - change.from.line);
	    shiftDoc(doc, shift);
	    change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),
	              text: [lst(change.text)], origin: change.origin};
	  }
	  var last = doc.lastLine();
	  if (change.to.line > last) {
	    change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),
	              text: [change.text[0]], origin: change.origin};
	  }

	  change.removed = getBetween(doc, change.from, change.to);

	  if (!selAfter) { selAfter = computeSelAfterChange(doc, change); }
	  if (doc.cm) { makeChangeSingleDocInEditor(doc.cm, change, spans); }
	  else { updateDoc(doc, change, spans); }
	  setSelectionNoUndo(doc, selAfter, sel_dontScroll);
	}

	// Handle the interaction of a change to a document with the editor
	// that this document is part of.
	function makeChangeSingleDocInEditor(cm, change, spans) {
	  var doc = cm.doc, display = cm.display, from = change.from, to = change.to;

	  var recomputeMaxLength = false, checkWidthStart = from.line;
	  if (!cm.options.lineWrapping) {
	    checkWidthStart = lineNo(visualLine(getLine(doc, from.line)));
	    doc.iter(checkWidthStart, to.line + 1, function (line) {
	      if (line == display.maxLine) {
	        recomputeMaxLength = true;
	        return true
	      }
	    });
	  }

	  if (doc.sel.contains(change.from, change.to) > -1)
	    { signalCursorActivity(cm); }

	  updateDoc(doc, change, spans, estimateHeight(cm));

	  if (!cm.options.lineWrapping) {
	    doc.iter(checkWidthStart, from.line + change.text.length, function (line) {
	      var len = lineLength(line);
	      if (len > display.maxLineLength) {
	        display.maxLine = line;
	        display.maxLineLength = len;
	        display.maxLineChanged = true;
	        recomputeMaxLength = false;
	      }
	    });
	    if (recomputeMaxLength) { cm.curOp.updateMaxLine = true; }
	  }

	  retreatFrontier(doc, from.line);
	  startWorker(cm, 400);

	  var lendiff = change.text.length - (to.line - from.line) - 1;
	  // Remember that these lines changed, for updating the display
	  if (change.full)
	    { regChange(cm); }
	  else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change))
	    { regLineChange(cm, from.line, "text"); }
	  else
	    { regChange(cm, from.line, to.line + 1, lendiff); }

	  var changesHandler = hasHandler(cm, "changes"), changeHandler = hasHandler(cm, "change");
	  if (changeHandler || changesHandler) {
	    var obj = {
	      from: from, to: to,
	      text: change.text,
	      removed: change.removed,
	      origin: change.origin
	    };
	    if (changeHandler) { signalLater(cm, "change", cm, obj); }
	    if (changesHandler) { (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj); }
	  }
	  cm.display.selForContextMenu = null;
	}

	function replaceRange(doc, code, from, to, origin) {
	  if (!to) { to = from; }
	  if (cmp(to, from) < 0) { var tmp = to; to = from; from = tmp; }
	  if (typeof code == "string") { code = doc.splitLines(code); }
	  makeChange(doc, {from: from, to: to, text: code, origin: origin});
	}

	// Rebasing/resetting history to deal with externally-sourced changes

	function rebaseHistSelSingle(pos, from, to, diff) {
	  if (to < pos.line) {
	    pos.line += diff;
	  } else if (from < pos.line) {
	    pos.line = from;
	    pos.ch = 0;
	  }
	}

	// Tries to rebase an array of history events given a change in the
	// document. If the change touches the same lines as the event, the
	// event, and everything 'behind' it, is discarded. If the change is
	// before the event, the event's positions are updated. Uses a
	// copy-on-write scheme for the positions, to avoid having to
	// reallocate them all on every rebase, but also avoid problems with
	// shared position objects being unsafely updated.
	function rebaseHistArray(array, from, to, diff) {
	  for (var i = 0; i < array.length; ++i) {
	    var sub = array[i], ok = true;
	    if (sub.ranges) {
	      if (!sub.copied) { sub = array[i] = sub.deepCopy(); sub.copied = true; }
	      for (var j = 0; j < sub.ranges.length; j++) {
	        rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff);
	        rebaseHistSelSingle(sub.ranges[j].head, from, to, diff);
	      }
	      continue
	    }
	    for (var j$1 = 0; j$1 < sub.changes.length; ++j$1) {
	      var cur = sub.changes[j$1];
	      if (to < cur.from.line) {
	        cur.from = Pos(cur.from.line + diff, cur.from.ch);
	        cur.to = Pos(cur.to.line + diff, cur.to.ch);
	      } else if (from <= cur.to.line) {
	        ok = false;
	        break
	      }
	    }
	    if (!ok) {
	      array.splice(0, i + 1);
	      i = 0;
	    }
	  }
	}

	function rebaseHist(hist, change) {
	  var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1;
	  rebaseHistArray(hist.done, from, to, diff);
	  rebaseHistArray(hist.undone, from, to, diff);
	}

	// Utility for applying a change to a line by handle or number,
	// returning the number and optionally registering the line as
	// changed.
	function changeLine(doc, handle, changeType, op) {
	  var no = handle, line = handle;
	  if (typeof handle == "number") { line = getLine(doc, clipLine(doc, handle)); }
	  else { no = lineNo(handle); }
	  if (no == null) { return null }
	  if (op(line, no) && doc.cm) { regLineChange(doc.cm, no, changeType); }
	  return line
	}

	// The document is represented as a BTree consisting of leaves, with
	// chunk of lines in them, and branches, with up to ten leaves or
	// other branch nodes below them. The top node is always a branch
	// node, and is the document object itself (meaning it has
	// additional methods and properties).
	//
	// All nodes have parent links. The tree is used both to go from
	// line numbers to line objects, and to go from objects to numbers.
	// It also indexes by height, and is used to convert between height
	// and line object, and to find the total height of the document.
	//
	// See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html

	function LeafChunk(lines) {
	  var this$1 = this;

	  this.lines = lines;
	  this.parent = null;
	  var height = 0;
	  for (var i = 0; i < lines.length; ++i) {
	    lines[i].parent = this$1;
	    height += lines[i].height;
	  }
	  this.height = height;
	}

	LeafChunk.prototype = {
	  chunkSize: function chunkSize() { return this.lines.length },

	  // Remove the n lines at offset 'at'.
	  removeInner: function removeInner(at, n) {
	    var this$1 = this;

	    for (var i = at, e = at + n; i < e; ++i) {
	      var line = this$1.lines[i];
	      this$1.height -= line.height;
	      cleanUpLine(line);
	      signalLater(line, "delete");
	    }
	    this.lines.splice(at, n);
	  },

	  // Helper used to collapse a small branch into a single leaf.
	  collapse: function collapse(lines) {
	    lines.push.apply(lines, this.lines);
	  },

	  // Insert the given array of lines at offset 'at', count them as
	  // having the given height.
	  insertInner: function insertInner(at, lines, height) {
	    var this$1 = this;

	    this.height += height;
	    this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
	    for (var i = 0; i < lines.length; ++i) { lines[i].parent = this$1; }
	  },

	  // Used to iterate over a part of the tree.
	  iterN: function iterN(at, n, op) {
	    var this$1 = this;

	    for (var e = at + n; at < e; ++at)
	      { if (op(this$1.lines[at])) { return true } }
	  }
	};

	function BranchChunk(children) {
	  var this$1 = this;

	  this.children = children;
	  var size = 0, height = 0;
	  for (var i = 0; i < children.length; ++i) {
	    var ch = children[i];
	    size += ch.chunkSize(); height += ch.height;
	    ch.parent = this$1;
	  }
	  this.size = size;
	  this.height = height;
	  this.parent = null;
	}

	BranchChunk.prototype = {
	  chunkSize: function chunkSize() { return this.size },

	  removeInner: function removeInner(at, n) {
	    var this$1 = this;

	    this.size -= n;
	    for (var i = 0; i < this.children.length; ++i) {
	      var child = this$1.children[i], sz = child.chunkSize();
	      if (at < sz) {
	        var rm = Math.min(n, sz - at), oldHeight = child.height;
	        child.removeInner(at, rm);
	        this$1.height -= oldHeight - child.height;
	        if (sz == rm) { this$1.children.splice(i--, 1); child.parent = null; }
	        if ((n -= rm) == 0) { break }
	        at = 0;
	      } else { at -= sz; }
	    }
	    // If the result is smaller than 25 lines, ensure that it is a
	    // single leaf node.
	    if (this.size - n < 25 &&
	        (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {
	      var lines = [];
	      this.collapse(lines);
	      this.children = [new LeafChunk(lines)];
	      this.children[0].parent = this;
	    }
	  },

	  collapse: function collapse(lines) {
	    var this$1 = this;

	    for (var i = 0; i < this.children.length; ++i) { this$1.children[i].collapse(lines); }
	  },

	  insertInner: function insertInner(at, lines, height) {
	    var this$1 = this;

	    this.size += lines.length;
	    this.height += height;
	    for (var i = 0; i < this.children.length; ++i) {
	      var child = this$1.children[i], sz = child.chunkSize();
	      if (at <= sz) {
	        child.insertInner(at, lines, height);
	        if (child.lines && child.lines.length > 50) {
	          // To avoid memory thrashing when child.lines is huge (e.g. first view of a large file), it's never spliced.
	          // Instead, small slices are taken. They're taken in order because sequential memory accesses are fastest.
	          var remaining = child.lines.length % 25 + 25;
	          for (var pos = remaining; pos < child.lines.length;) {
	            var leaf = new LeafChunk(child.lines.slice(pos, pos += 25));
	            child.height -= leaf.height;
	            this$1.children.splice(++i, 0, leaf);
	            leaf.parent = this$1;
	          }
	          child.lines = child.lines.slice(0, remaining);
	          this$1.maybeSpill();
	        }
	        break
	      }
	      at -= sz;
	    }
	  },

	  // When a node has grown, check whether it should be split.
	  maybeSpill: function maybeSpill() {
	    if (this.children.length <= 10) { return }
	    var me = this;
	    do {
	      var spilled = me.children.splice(me.children.length - 5, 5);
	      var sibling = new BranchChunk(spilled);
	      if (!me.parent) { // Become the parent node
	        var copy = new BranchChunk(me.children);
	        copy.parent = me;
	        me.children = [copy, sibling];
	        me = copy;
	     } else {
	        me.size -= sibling.size;
	        me.height -= sibling.height;
	        var myIndex = indexOf(me.parent.children, me);
	        me.parent.children.splice(myIndex + 1, 0, sibling);
	      }
	      sibling.parent = me.parent;
	    } while (me.children.length > 10)
	    me.parent.maybeSpill();
	  },

	  iterN: function iterN(at, n, op) {
	    var this$1 = this;

	    for (var i = 0; i < this.children.length; ++i) {
	      var child = this$1.children[i], sz = child.chunkSize();
	      if (at < sz) {
	        var used = Math.min(n, sz - at);
	        if (child.iterN(at, used, op)) { return true }
	        if ((n -= used) == 0) { break }
	        at = 0;
	      } else { at -= sz; }
	    }
	  }
	};

	// Line widgets are block elements displayed above or below a line.

	var LineWidget = function(doc, node, options) {
	  var this$1 = this;

	  if (options) { for (var opt in options) { if (options.hasOwnProperty(opt))
	    { this$1[opt] = options[opt]; } } }
	  this.doc = doc;
	  this.node = node;
	};

	LineWidget.prototype.clear = function () {
	    var this$1 = this;

	  var cm = this.doc.cm, ws = this.line.widgets, line = this.line, no = lineNo(line);
	  if (no == null || !ws) { return }
	  for (var i = 0; i < ws.length; ++i) { if (ws[i] == this$1) { ws.splice(i--, 1); } }
	  if (!ws.length) { line.widgets = null; }
	  var height = widgetHeight(this);
	  updateLineHeight(line, Math.max(0, line.height - height));
	  if (cm) {
	    runInOp(cm, function () {
	      adjustScrollWhenAboveVisible(cm, line, -height);
	      regLineChange(cm, no, "widget");
	    });
	    signalLater(cm, "lineWidgetCleared", cm, this, no);
	  }
	};

	LineWidget.prototype.changed = function () {
	    var this$1 = this;

	  var oldH = this.height, cm = this.doc.cm, line = this.line;
	  this.height = null;
	  var diff = widgetHeight(this) - oldH;
	  if (!diff) { return }
	  updateLineHeight(line, line.height + diff);
	  if (cm) {
	    runInOp(cm, function () {
	      cm.curOp.forceUpdate = true;
	      adjustScrollWhenAboveVisible(cm, line, diff);
	      signalLater(cm, "lineWidgetChanged", cm, this$1, lineNo(line));
	    });
	  }
	};
	eventMixin(LineWidget);

	function adjustScrollWhenAboveVisible(cm, line, diff) {
	  if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop))
	    { addToScrollTop(cm, diff); }
	}

	function addLineWidget(doc, handle, node, options) {
	  var widget = new LineWidget(doc, node, options);
	  var cm = doc.cm;
	  if (cm && widget.noHScroll) { cm.display.alignWidgets = true; }
	  changeLine(doc, handle, "widget", function (line) {
	    var widgets = line.widgets || (line.widgets = []);
	    if (widget.insertAt == null) { widgets.push(widget); }
	    else { widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget); }
	    widget.line = line;
	    if (cm && !lineIsHidden(doc, line)) {
	      var aboveVisible = heightAtLine(line) < doc.scrollTop;
	      updateLineHeight(line, line.height + widgetHeight(widget));
	      if (aboveVisible) { addToScrollTop(cm, widget.height); }
	      cm.curOp.forceUpdate = true;
	    }
	    return true
	  });
	  signalLater(cm, "lineWidgetAdded", cm, widget, typeof handle == "number" ? handle : lineNo(handle));
	  return widget
	}

	// TEXTMARKERS

	// Created with markText and setBookmark methods. A TextMarker is a
	// handle that can be used to clear or find a marked position in the
	// document. Line objects hold arrays (markedSpans) containing
	// {from, to, marker} object pointing to such marker objects, and
	// indicating that such a marker is present on that line. Multiple
	// lines may point to the same marker when it spans across lines.
	// The spans will have null for their from/to properties when the
	// marker continues beyond the start/end of the line. Markers have
	// links back to the lines they currently touch.

	// Collapsed markers have unique ids, in order to be able to order
	// them, which is needed for uniquely determining an outer marker
	// when they overlap (they may nest, but not partially overlap).
	var nextMarkerId = 0;

	var TextMarker = function(doc, type) {
	  this.lines = [];
	  this.type = type;
	  this.doc = doc;
	  this.id = ++nextMarkerId;
	};

	// Clear the marker.
	TextMarker.prototype.clear = function () {
	    var this$1 = this;

	  if (this.explicitlyCleared) { return }
	  var cm = this.doc.cm, withOp = cm && !cm.curOp;
	  if (withOp) { startOperation(cm); }
	  if (hasHandler(this, "clear")) {
	    var found = this.find();
	    if (found) { signalLater(this, "clear", found.from, found.to); }
	  }
	  var min = null, max = null;
	  for (var i = 0; i < this.lines.length; ++i) {
	    var line = this$1.lines[i];
	    var span = getMarkedSpanFor(line.markedSpans, this$1);
	    if (cm && !this$1.collapsed) { regLineChange(cm, lineNo(line), "text"); }
	    else if (cm) {
	      if (span.to != null) { max = lineNo(line); }
	      if (span.from != null) { min = lineNo(line); }
	    }
	    line.markedSpans = removeMarkedSpan(line.markedSpans, span);
	    if (span.from == null && this$1.collapsed && !lineIsHidden(this$1.doc, line) && cm)
	      { updateLineHeight(line, textHeight(cm.display)); }
	  }
	  if (cm && this.collapsed && !cm.options.lineWrapping) { for (var i$1 = 0; i$1 < this.lines.length; ++i$1) {
	    var visual = visualLine(this$1.lines[i$1]), len = lineLength(visual);
	    if (len > cm.display.maxLineLength) {
	      cm.display.maxLine = visual;
	      cm.display.maxLineLength = len;
	      cm.display.maxLineChanged = true;
	    }
	  } }

	  if (min != null && cm && this.collapsed) { regChange(cm, min, max + 1); }
	  this.lines.length = 0;
	  this.explicitlyCleared = true;
	  if (this.atomic && this.doc.cantEdit) {
	    this.doc.cantEdit = false;
	    if (cm) { reCheckSelection(cm.doc); }
	  }
	  if (cm) { signalLater(cm, "markerCleared", cm, this, min, max); }
	  if (withOp) { endOperation(cm); }
	  if (this.parent) { this.parent.clear(); }
	};

	// Find the position of the marker in the document. Returns a {from,
	// to} object by default. Side can be passed to get a specific side
	// -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the
	// Pos objects returned contain a line object, rather than a line
	// number (used to prevent looking up the same line twice).
	TextMarker.prototype.find = function (side, lineObj) {
	    var this$1 = this;

	  if (side == null && this.type == "bookmark") { side = 1; }
	  var from, to;
	  for (var i = 0; i < this.lines.length; ++i) {
	    var line = this$1.lines[i];
	    var span = getMarkedSpanFor(line.markedSpans, this$1);
	    if (span.from != null) {
	      from = Pos(lineObj ? line : lineNo(line), span.from);
	      if (side == -1) { return from }
	    }
	    if (span.to != null) {
	      to = Pos(lineObj ? line : lineNo(line), span.to);
	      if (side == 1) { return to }
	    }
	  }
	  return from && {from: from, to: to}
	};

	// Signals that the marker's widget changed, and surrounding layout
	// should be recomputed.
	TextMarker.prototype.changed = function () {
	    var this$1 = this;

	  var pos = this.find(-1, true), widget = this, cm = this.doc.cm;
	  if (!pos || !cm) { return }
	  runInOp(cm, function () {
	    var line = pos.line, lineN = lineNo(pos.line);
	    var view = findViewForLine(cm, lineN);
	    if (view) {
	      clearLineMeasurementCacheFor(view);
	      cm.curOp.selectionChanged = cm.curOp.forceUpdate = true;
	    }
	    cm.curOp.updateMaxLine = true;
	    if (!lineIsHidden(widget.doc, line) && widget.height != null) {
	      var oldHeight = widget.height;
	      widget.height = null;
	      var dHeight = widgetHeight(widget) - oldHeight;
	      if (dHeight)
	        { updateLineHeight(line, line.height + dHeight); }
	    }
	    signalLater(cm, "markerChanged", cm, this$1);
	  });
	};

	TextMarker.prototype.attachLine = function (line) {
	  if (!this.lines.length && this.doc.cm) {
	    var op = this.doc.cm.curOp;
	    if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1)
	      { (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this); }
	  }
	  this.lines.push(line);
	};

	TextMarker.prototype.detachLine = function (line) {
	  this.lines.splice(indexOf(this.lines, line), 1);
	  if (!this.lines.length && this.doc.cm) {
	    var op = this.doc.cm.curOp;(op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);
	  }
	};
	eventMixin(TextMarker);

	// Create a marker, wire it up to the right lines, and
	function markText(doc, from, to, options, type) {
	  // Shared markers (across linked documents) are handled separately
	  // (markTextShared will call out to this again, once per
	  // document).
	  if (options && options.shared) { return markTextShared(doc, from, to, options, type) }
	  // Ensure we are in an operation.
	  if (doc.cm && !doc.cm.curOp) { return operation(doc.cm, markText)(doc, from, to, options, type) }

	  var marker = new TextMarker(doc, type), diff = cmp(from, to);
	  if (options) { copyObj(options, marker, false); }
	  // Don't connect empty markers unless clearWhenEmpty is false
	  if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false)
	    { return marker }
	  if (marker.replacedWith) {
	    // Showing up as a widget implies collapsed (widget replaces text)
	    marker.collapsed = true;
	    marker.widgetNode = eltP("span", [marker.replacedWith], "CodeMirror-widget");
	    if (!options.handleMouseEvents) { marker.widgetNode.setAttribute("cm-ignore-events", "true"); }
	    if (options.insertLeft) { marker.widgetNode.insertLeft = true; }
	  }
	  if (marker.collapsed) {
	    if (conflictingCollapsedRange(doc, from.line, from, to, marker) ||
	        from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker))
	      { throw new Error("Inserting collapsed marker partially overlapping an existing one") }
	    seeCollapsedSpans();
	  }

	  if (marker.addToHistory)
	    { addChangeToHistory(doc, {from: from, to: to, origin: "markText"}, doc.sel, NaN); }

	  var curLine = from.line, cm = doc.cm, updateMaxLine;
	  doc.iter(curLine, to.line + 1, function (line) {
	    if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine)
	      { updateMaxLine = true; }
	    if (marker.collapsed && curLine != from.line) { updateLineHeight(line, 0); }
	    addMarkedSpan(line, new MarkedSpan(marker,
	                                       curLine == from.line ? from.ch : null,
	                                       curLine == to.line ? to.ch : null));
	    ++curLine;
	  });
	  // lineIsHidden depends on the presence of the spans, so needs a second pass
	  if (marker.collapsed) { doc.iter(from.line, to.line + 1, function (line) {
	    if (lineIsHidden(doc, line)) { updateLineHeight(line, 0); }
	  }); }

	  if (marker.clearOnEnter) { on(marker, "beforeCursorEnter", function () { return marker.clear(); }); }

	  if (marker.readOnly) {
	    seeReadOnlySpans();
	    if (doc.history.done.length || doc.history.undone.length)
	      { doc.clearHistory(); }
	  }
	  if (marker.collapsed) {
	    marker.id = ++nextMarkerId;
	    marker.atomic = true;
	  }
	  if (cm) {
	    // Sync editor state
	    if (updateMaxLine) { cm.curOp.updateMaxLine = true; }
	    if (marker.collapsed)
	      { regChange(cm, from.line, to.line + 1); }
	    else if (marker.className || marker.title || marker.startStyle || marker.endStyle || marker.css)
	      { for (var i = from.line; i <= to.line; i++) { regLineChange(cm, i, "text"); } }
	    if (marker.atomic) { reCheckSelection(cm.doc); }
	    signalLater(cm, "markerAdded", cm, marker);
	  }
	  return marker
	}

	// SHARED TEXTMARKERS

	// A shared marker spans multiple linked documents. It is
	// implemented as a meta-marker-object controlling multiple normal
	// markers.
	var SharedTextMarker = function(markers, primary) {
	  var this$1 = this;

	  this.markers = markers;
	  this.primary = primary;
	  for (var i = 0; i < markers.length; ++i)
	    { markers[i].parent = this$1; }
	};

	SharedTextMarker.prototype.clear = function () {
	    var this$1 = this;

	  if (this.explicitlyCleared) { return }
	  this.explicitlyCleared = true;
	  for (var i = 0; i < this.markers.length; ++i)
	    { this$1.markers[i].clear(); }
	  signalLater(this, "clear");
	};

	SharedTextMarker.prototype.find = function (side, lineObj) {
	  return this.primary.find(side, lineObj)
	};
	eventMixin(SharedTextMarker);

	function markTextShared(doc, from, to, options, type) {
	  options = copyObj(options);
	  options.shared = false;
	  var markers = [markText(doc, from, to, options, type)], primary = markers[0];
	  var widget = options.widgetNode;
	  linkedDocs(doc, function (doc) {
	    if (widget) { options.widgetNode = widget.cloneNode(true); }
	    markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));
	    for (var i = 0; i < doc.linked.length; ++i)
	      { if (doc.linked[i].isParent) { return } }
	    primary = lst(markers);
	  });
	  return new SharedTextMarker(markers, primary)
	}

	function findSharedMarkers(doc) {
	  return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())), function (m) { return m.parent; })
	}

	function copySharedMarkers(doc, markers) {
	  for (var i = 0; i < markers.length; i++) {
	    var marker = markers[i], pos = marker.find();
	    var mFrom = doc.clipPos(pos.from), mTo = doc.clipPos(pos.to);
	    if (cmp(mFrom, mTo)) {
	      var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type);
	      marker.markers.push(subMark);
	      subMark.parent = marker;
	    }
	  }
	}

	function detachSharedMarkers(markers) {
	  var loop = function ( i ) {
	    var marker = markers[i], linked = [marker.primary.doc];
	    linkedDocs(marker.primary.doc, function (d) { return linked.push(d); });
	    for (var j = 0; j < marker.markers.length; j++) {
	      var subMarker = marker.markers[j];
	      if (indexOf(linked, subMarker.doc) == -1) {
	        subMarker.parent = null;
	        marker.markers.splice(j--, 1);
	      }
	    }
	  };

	  for (var i = 0; i < markers.length; i++) loop( i );
	}

	var nextDocId = 0;
	var Doc = function(text, mode, firstLine, lineSep, direction) {
	  if (!(this instanceof Doc)) { return new Doc(text, mode, firstLine, lineSep, direction) }
	  if (firstLine == null) { firstLine = 0; }

	  BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);
	  this.first = firstLine;
	  this.scrollTop = this.scrollLeft = 0;
	  this.cantEdit = false;
	  this.cleanGeneration = 1;
	  this.modeFrontier = this.highlightFrontier = firstLine;
	  var start = Pos(firstLine, 0);
	  this.sel = simpleSelection(start);
	  this.history = new History(null);
	  this.id = ++nextDocId;
	  this.modeOption = mode;
	  this.lineSep = lineSep;
	  this.direction = (direction == "rtl") ? "rtl" : "ltr";
	  this.extend = false;

	  if (typeof text == "string") { text = this.splitLines(text); }
	  updateDoc(this, {from: start, to: start, text: text});
	  setSelection(this, simpleSelection(start), sel_dontScroll);
	};

	Doc.prototype = createObj(BranchChunk.prototype, {
	  constructor: Doc,
	  // Iterate over the document. Supports two forms -- with only one
	  // argument, it calls that for each line in the document. With
	  // three, it iterates over the range given by the first two (with
	  // the second being non-inclusive).
	  iter: function(from, to, op) {
	    if (op) { this.iterN(from - this.first, to - from, op); }
	    else { this.iterN(this.first, this.first + this.size, from); }
	  },

	  // Non-public interface for adding and removing lines.
	  insert: function(at, lines) {
	    var height = 0;
	    for (var i = 0; i < lines.length; ++i) { height += lines[i].height; }
	    this.insertInner(at - this.first, lines, height);
	  },
	  remove: function(at, n) { this.removeInner(at - this.first, n); },

	  // From here, the methods are part of the public interface. Most
	  // are also available from CodeMirror (editor) instances.

	  getValue: function(lineSep) {
	    var lines = getLines(this, this.first, this.first + this.size);
	    if (lineSep === false) { return lines }
	    return lines.join(lineSep || this.lineSeparator())
	  },
	  setValue: docMethodOp(function(code) {
	    var top = Pos(this.first, 0), last = this.first + this.size - 1;
	    makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),
	                      text: this.splitLines(code), origin: "setValue", full: true}, true);
	    if (this.cm) { scrollToCoords(this.cm, 0, 0); }
	    setSelection(this, simpleSelection(top), sel_dontScroll);
	  }),
	  replaceRange: function(code, from, to, origin) {
	    from = clipPos(this, from);
	    to = to ? clipPos(this, to) : from;
	    replaceRange(this, code, from, to, origin);
	  },
	  getRange: function(from, to, lineSep) {
	    var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
	    if (lineSep === false) { return lines }
	    return lines.join(lineSep || this.lineSeparator())
	  },

	  getLine: function(line) {var l = this.getLineHandle(line); return l && l.text},

	  getLineHandle: function(line) {if (isLine(this, line)) { return getLine(this, line) }},
	  getLineNumber: function(line) {return lineNo(line)},

	  getLineHandleVisualStart: function(line) {
	    if (typeof line == "number") { line = getLine(this, line); }
	    return visualLine(line)
	  },

	  lineCount: function() {return this.size},
	  firstLine: function() {return this.first},
	  lastLine: function() {return this.first + this.size - 1},

	  clipPos: function(pos) {return clipPos(this, pos)},

	  getCursor: function(start) {
	    var range$$1 = this.sel.primary(), pos;
	    if (start == null || start == "head") { pos = range$$1.head; }
	    else if (start == "anchor") { pos = range$$1.anchor; }
	    else if (start == "end" || start == "to" || start === false) { pos = range$$1.to(); }
	    else { pos = range$$1.from(); }
	    return pos
	  },
	  listSelections: function() { return this.sel.ranges },
	  somethingSelected: function() {return this.sel.somethingSelected()},

	  setCursor: docMethodOp(function(line, ch, options) {
	    setSimpleSelection(this, clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line), null, options);
	  }),
	  setSelection: docMethodOp(function(anchor, head, options) {
	    setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options);
	  }),
	  extendSelection: docMethodOp(function(head, other, options) {
	    extendSelection(this, clipPos(this, head), other && clipPos(this, other), options);
	  }),
	  extendSelections: docMethodOp(function(heads, options) {
	    extendSelections(this, clipPosArray(this, heads), options);
	  }),
	  extendSelectionsBy: docMethodOp(function(f, options) {
	    var heads = map(this.sel.ranges, f);
	    extendSelections(this, clipPosArray(this, heads), options);
	  }),
	  setSelections: docMethodOp(function(ranges, primary, options) {
	    var this$1 = this;

	    if (!ranges.length) { return }
	    var out = [];
	    for (var i = 0; i < ranges.length; i++)
	      { out[i] = new Range(clipPos(this$1, ranges[i].anchor),
	                         clipPos(this$1, ranges[i].head)); }
	    if (primary == null) { primary = Math.min(ranges.length - 1, this.sel.primIndex); }
	    setSelection(this, normalizeSelection(out, primary), options);
	  }),
	  addSelection: docMethodOp(function(anchor, head, options) {
	    var ranges = this.sel.ranges.slice(0);
	    ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)));
	    setSelection(this, normalizeSelection(ranges, ranges.length - 1), options);
	  }),

	  getSelection: function(lineSep) {
	    var this$1 = this;

	    var ranges = this.sel.ranges, lines;
	    for (var i = 0; i < ranges.length; i++) {
	      var sel = getBetween(this$1, ranges[i].from(), ranges[i].to());
	      lines = lines ? lines.concat(sel) : sel;
	    }
	    if (lineSep === false) { return lines }
	    else { return lines.join(lineSep || this.lineSeparator()) }
	  },
	  getSelections: function(lineSep) {
	    var this$1 = this;

	    var parts = [], ranges = this.sel.ranges;
	    for (var i = 0; i < ranges.length; i++) {
	      var sel = getBetween(this$1, ranges[i].from(), ranges[i].to());
	      if (lineSep !== false) { sel = sel.join(lineSep || this$1.lineSeparator()); }
	      parts[i] = sel;
	    }
	    return parts
	  },
	  replaceSelection: function(code, collapse, origin) {
	    var dup = [];
	    for (var i = 0; i < this.sel.ranges.length; i++)
	      { dup[i] = code; }
	    this.replaceSelections(dup, collapse, origin || "+input");
	  },
	  replaceSelections: docMethodOp(function(code, collapse, origin) {
	    var this$1 = this;

	    var changes = [], sel = this.sel;
	    for (var i = 0; i < sel.ranges.length; i++) {
	      var range$$1 = sel.ranges[i];
	      changes[i] = {from: range$$1.from(), to: range$$1.to(), text: this$1.splitLines(code[i]), origin: origin};
	    }
	    var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse);
	    for (var i$1 = changes.length - 1; i$1 >= 0; i$1--)
	      { makeChange(this$1, changes[i$1]); }
	    if (newSel) { setSelectionReplaceHistory(this, newSel); }
	    else if (this.cm) { ensureCursorVisible(this.cm); }
	  }),
	  undo: docMethodOp(function() {makeChangeFromHistory(this, "undo");}),
	  redo: docMethodOp(function() {makeChangeFromHistory(this, "redo");}),
	  undoSelection: docMethodOp(function() {makeChangeFromHistory(this, "undo", true);}),
	  redoSelection: docMethodOp(function() {makeChangeFromHistory(this, "redo", true);}),

	  setExtending: function(val) {this.extend = val;},
	  getExtending: function() {return this.extend},

	  historySize: function() {
	    var hist = this.history, done = 0, undone = 0;
	    for (var i = 0; i < hist.done.length; i++) { if (!hist.done[i].ranges) { ++done; } }
	    for (var i$1 = 0; i$1 < hist.undone.length; i$1++) { if (!hist.undone[i$1].ranges) { ++undone; } }
	    return {undo: done, redo: undone}
	  },
	  clearHistory: function() {this.history = new History(this.history.maxGeneration);},

	  markClean: function() {
	    this.cleanGeneration = this.changeGeneration(true);
	  },
	  changeGeneration: function(forceSplit) {
	    if (forceSplit)
	      { this.history.lastOp = this.history.lastSelOp = this.history.lastOrigin = null; }
	    return this.history.generation
	  },
	  isClean: function (gen) {
	    return this.history.generation == (gen || this.cleanGeneration)
	  },

	  getHistory: function() {
	    return {done: copyHistoryArray(this.history.done),
	            undone: copyHistoryArray(this.history.undone)}
	  },
	  setHistory: function(histData) {
	    var hist = this.history = new History(this.history.maxGeneration);
	    hist.done = copyHistoryArray(histData.done.slice(0), null, true);
	    hist.undone = copyHistoryArray(histData.undone.slice(0), null, true);
	  },

	  setGutterMarker: docMethodOp(function(line, gutterID, value) {
	    return changeLine(this, line, "gutter", function (line) {
	      var markers = line.gutterMarkers || (line.gutterMarkers = {});
	      markers[gutterID] = value;
	      if (!value && isEmpty(markers)) { line.gutterMarkers = null; }
	      return true
	    })
	  }),

	  clearGutter: docMethodOp(function(gutterID) {
	    var this$1 = this;

	    this.iter(function (line) {
	      if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
	        changeLine(this$1, line, "gutter", function () {
	          line.gutterMarkers[gutterID] = null;
	          if (isEmpty(line.gutterMarkers)) { line.gutterMarkers = null; }
	          return true
	        });
	      }
	    });
	  }),

	  lineInfo: function(line) {
	    var n;
	    if (typeof line == "number") {
	      if (!isLine(this, line)) { return null }
	      n = line;
	      line = getLine(this, line);
	      if (!line) { return null }
	    } else {
	      n = lineNo(line);
	      if (n == null) { return null }
	    }
	    return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,
	            textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,
	            widgets: line.widgets}
	  },

	  addLineClass: docMethodOp(function(handle, where, cls) {
	    return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {
	      var prop = where == "text" ? "textClass"
	               : where == "background" ? "bgClass"
	               : where == "gutter" ? "gutterClass" : "wrapClass";
	      if (!line[prop]) { line[prop] = cls; }
	      else if (classTest(cls).test(line[prop])) { return false }
	      else { line[prop] += " " + cls; }
	      return true
	    })
	  }),
	  removeLineClass: docMethodOp(function(handle, where, cls) {
	    return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {
	      var prop = where == "text" ? "textClass"
	               : where == "background" ? "bgClass"
	               : where == "gutter" ? "gutterClass" : "wrapClass";
	      var cur = line[prop];
	      if (!cur) { return false }
	      else if (cls == null) { line[prop] = null; }
	      else {
	        var found = cur.match(classTest(cls));
	        if (!found) { return false }
	        var end = found.index + found[0].length;
	        line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null;
	      }
	      return true
	    })
	  }),

	  addLineWidget: docMethodOp(function(handle, node, options) {
	    return addLineWidget(this, handle, node, options)
	  }),
	  removeLineWidget: function(widget) { widget.clear(); },

	  markText: function(from, to, options) {
	    return markText(this, clipPos(this, from), clipPos(this, to), options, options && options.type || "range")
	  },
	  setBookmark: function(pos, options) {
	    var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),
	                    insertLeft: options && options.insertLeft,
	                    clearWhenEmpty: false, shared: options && options.shared,
	                    handleMouseEvents: options && options.handleMouseEvents};
	    pos = clipPos(this, pos);
	    return markText(this, pos, pos, realOpts, "bookmark")
	  },
	  findMarksAt: function(pos) {
	    pos = clipPos(this, pos);
	    var markers = [], spans = getLine(this, pos.line).markedSpans;
	    if (spans) { for (var i = 0; i < spans.length; ++i) {
	      var span = spans[i];
	      if ((span.from == null || span.from <= pos.ch) &&
	          (span.to == null || span.to >= pos.ch))
	        { markers.push(span.marker.parent || span.marker); }
	    } }
	    return markers
	  },
	  findMarks: function(from, to, filter) {
	    from = clipPos(this, from); to = clipPos(this, to);
	    var found = [], lineNo$$1 = from.line;
	    this.iter(from.line, to.line + 1, function (line) {
	      var spans = line.markedSpans;
	      if (spans) { for (var i = 0; i < spans.length; i++) {
	        var span = spans[i];
	        if (!(span.to != null && lineNo$$1 == from.line && from.ch >= span.to ||
	              span.from == null && lineNo$$1 != from.line ||
	              span.from != null && lineNo$$1 == to.line && span.from >= to.ch) &&
	            (!filter || filter(span.marker)))
	          { found.push(span.marker.parent || span.marker); }
	      } }
	      ++lineNo$$1;
	    });
	    return found
	  },
	  getAllMarks: function() {
	    var markers = [];
	    this.iter(function (line) {
	      var sps = line.markedSpans;
	      if (sps) { for (var i = 0; i < sps.length; ++i)
	        { if (sps[i].from != null) { markers.push(sps[i].marker); } } }
	    });
	    return markers
	  },

	  posFromIndex: function(off) {
	    var ch, lineNo$$1 = this.first, sepSize = this.lineSeparator().length;
	    this.iter(function (line) {
	      var sz = line.text.length + sepSize;
	      if (sz > off) { ch = off; return true }
	      off -= sz;
	      ++lineNo$$1;
	    });
	    return clipPos(this, Pos(lineNo$$1, ch))
	  },
	  indexFromPos: function (coords) {
	    coords = clipPos(this, coords);
	    var index = coords.ch;
	    if (coords.line < this.first || coords.ch < 0) { return 0 }
	    var sepSize = this.lineSeparator().length;
	    this.iter(this.first, coords.line, function (line) { // iter aborts when callback returns a truthy value
	      index += line.text.length + sepSize;
	    });
	    return index
	  },

	  copy: function(copyHistory) {
	    var doc = new Doc(getLines(this, this.first, this.first + this.size),
	                      this.modeOption, this.first, this.lineSep, this.direction);
	    doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft;
	    doc.sel = this.sel;
	    doc.extend = false;
	    if (copyHistory) {
	      doc.history.undoDepth = this.history.undoDepth;
	      doc.setHistory(this.getHistory());
	    }
	    return doc
	  },

	  linkedDoc: function(options) {
	    if (!options) { options = {}; }
	    var from = this.first, to = this.first + this.size;
	    if (options.from != null && options.from > from) { from = options.from; }
	    if (options.to != null && options.to < to) { to = options.to; }
	    var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from, this.lineSep, this.direction);
	    if (options.sharedHist) { copy.history = this.history
	    ; }(this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist});
	    copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}];
	    copySharedMarkers(copy, findSharedMarkers(this));
	    return copy
	  },
	  unlinkDoc: function(other) {
	    var this$1 = this;

	    if (other instanceof CodeMirror$1) { other = other.doc; }
	    if (this.linked) { for (var i = 0; i < this.linked.length; ++i) {
	      var link = this$1.linked[i];
	      if (link.doc != other) { continue }
	      this$1.linked.splice(i, 1);
	      other.unlinkDoc(this$1);
	      detachSharedMarkers(findSharedMarkers(this$1));
	      break
	    } }
	    // If the histories were shared, split them again
	    if (other.history == this.history) {
	      var splitIds = [other.id];
	      linkedDocs(other, function (doc) { return splitIds.push(doc.id); }, true);
	      other.history = new History(null);
	      other.history.done = copyHistoryArray(this.history.done, splitIds);
	      other.history.undone = copyHistoryArray(this.history.undone, splitIds);
	    }
	  },
	  iterLinkedDocs: function(f) {linkedDocs(this, f);},

	  getMode: function() {return this.mode},
	  getEditor: function() {return this.cm},

	  splitLines: function(str) {
	    if (this.lineSep) { return str.split(this.lineSep) }
	    return splitLinesAuto(str)
	  },
	  lineSeparator: function() { return this.lineSep || "\n" },

	  setDirection: docMethodOp(function (dir) {
	    if (dir != "rtl") { dir = "ltr"; }
	    if (dir == this.direction) { return }
	    this.direction = dir;
	    this.iter(function (line) { return line.order = null; });
	    if (this.cm) { directionChanged(this.cm); }
	  })
	});

	// Public alias.
	Doc.prototype.eachLine = Doc.prototype.iter;

	// Kludge to work around strange IE behavior where it'll sometimes
	// re-fire a series of drag-related events right after the drop (#1551)
	var lastDrop = 0;

	function onDrop(e) {
	  var cm = this;
	  clearDragCursor(cm);
	  if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e))
	    { return }
	  e_preventDefault(e);
	  if (ie) { lastDrop = +new Date; }
	  var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files;
	  if (!pos || cm.isReadOnly()) { return }
	  // Might be a file drop, in which case we simply extract the text
	  // and insert it.
	  if (files && files.length && window.FileReader && window.File) {
	    var n = files.length, text = Array(n), read = 0;
	    var loadFile = function (file, i) {
	      if (cm.options.allowDropFileTypes &&
	          indexOf(cm.options.allowDropFileTypes, file.type) == -1)
	        { return }

	      var reader = new FileReader;
	      reader.onload = operation(cm, function () {
	        var content = reader.result;
	        if (/[\x00-\x08\x0e-\x1f]{2}/.test(content)) { content = ""; }
	        text[i] = content;
	        if (++read == n) {
	          pos = clipPos(cm.doc, pos);
	          var change = {from: pos, to: pos,
	                        text: cm.doc.splitLines(text.join(cm.doc.lineSeparator())),
	                        origin: "paste"};
	          makeChange(cm.doc, change);
	          setSelectionReplaceHistory(cm.doc, simpleSelection(pos, changeEnd(change)));
	        }
	      });
	      reader.readAsText(file);
	    };
	    for (var i = 0; i < n; ++i) { loadFile(files[i], i); }
	  } else { // Normal drop
	    // Don't do a replace if the drop happened inside of the selected text.
	    if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
	      cm.state.draggingText(e);
	      // Ensure the editor is re-focused
	      setTimeout(function () { return cm.display.input.focus(); }, 20);
	      return
	    }
	    try {
	      var text$1 = e.dataTransfer.getData("Text");
	      if (text$1) {
	        var selected;
	        if (cm.state.draggingText && !cm.state.draggingText.copy)
	          { selected = cm.listSelections(); }
	        setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));
	        if (selected) { for (var i$1 = 0; i$1 < selected.length; ++i$1)
	          { replaceRange(cm.doc, "", selected[i$1].anchor, selected[i$1].head, "drag"); } }
	        cm.replaceSelection(text$1, "around", "paste");
	        cm.display.input.focus();
	      }
	    }
	    catch(e){}
	  }
	}

	function onDragStart(cm, e) {
	  if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return }
	  if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) { return }

	  e.dataTransfer.setData("Text", cm.getSelection());
	  e.dataTransfer.effectAllowed = "copyMove";

	  // Use dummy image instead of default browsers image.
	  // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
	  if (e.dataTransfer.setDragImage && !safari) {
	    var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
	    img.src = "";
	    if (presto) {
	      img.width = img.height = 1;
	      cm.display.wrapper.appendChild(img);
	      // Force a relayout, or Opera won't use our image for some obscure reason
	      img._top = img.offsetTop;
	    }
	    e.dataTransfer.setDragImage(img, 0, 0);
	    if (presto) { img.parentNode.removeChild(img); }
	  }
	}

	function onDragOver(cm, e) {
	  var pos = posFromMouse(cm, e);
	  if (!pos) { return }
	  var frag = document.createDocumentFragment();
	  drawSelectionCursor(cm, pos, frag);
	  if (!cm.display.dragCursor) {
	    cm.display.dragCursor = elt("div", null, "CodeMirror-cursors CodeMirror-dragcursors");
	    cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv);
	  }
	  removeChildrenAndAdd(cm.display.dragCursor, frag);
	}

	function clearDragCursor(cm) {
	  if (cm.display.dragCursor) {
	    cm.display.lineSpace.removeChild(cm.display.dragCursor);
	    cm.display.dragCursor = null;
	  }
	}

	// These must be handled carefully, because naively registering a
	// handler for each editor will cause the editors to never be
	// garbage collected.

	function forEachCodeMirror(f) {
	  if (!document.getElementsByClassName) { return }
	  var byClass = document.getElementsByClassName("CodeMirror");
	  for (var i = 0; i < byClass.length; i++) {
	    var cm = byClass[i].CodeMirror;
	    if (cm) { f(cm); }
	  }
	}

	var globalsRegistered = false;
	function ensureGlobalHandlers() {
	  if (globalsRegistered) { return }
	  registerGlobalHandlers();
	  globalsRegistered = true;
	}
	function registerGlobalHandlers() {
	  // When the window resizes, we need to refresh active editors.
	  var resizeTimer;
	  on(window, "resize", function () {
	    if (resizeTimer == null) { resizeTimer = setTimeout(function () {
	      resizeTimer = null;
	      forEachCodeMirror(onResize);
	    }, 100); }
	  });
	  // When the window loses focus, we want to show the editor as blurred
	  on(window, "blur", function () { return forEachCodeMirror(onBlur); });
	}
	// Called when the window resizes
	function onResize(cm) {
	  var d = cm.display;
	  if (d.lastWrapHeight == d.wrapper.clientHeight && d.lastWrapWidth == d.wrapper.clientWidth)
	    { return }
	  // Might be a text scaling operation, clear size caches.
	  d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
	  d.scrollbarsClipped = false;
	  cm.setSize();
	}

	var keyNames = {
	  3: "Enter", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
	  19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
	  36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
	  46: "Delete", 59: ";", 61: "=", 91: "Mod", 92: "Mod", 93: "Mod",
	  106: "*", 107: "=", 109: "-", 110: ".", 111: "/", 127: "Delete",
	  173: "-", 186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
	  221: "]", 222: "'", 63232: "Up", 63233: "Down", 63234: "Left", 63235: "Right", 63272: "Delete",
	  63273: "Home", 63275: "End", 63276: "PageUp", 63277: "PageDown", 63302: "Insert"
	};

	// Number keys
	for (var i = 0; i < 10; i++) { keyNames[i + 48] = keyNames[i + 96] = String(i); }
	// Alphabetic keys
	for (var i$1 = 65; i$1 <= 90; i$1++) { keyNames[i$1] = String.fromCharCode(i$1); }
	// Function keys
	for (var i$2 = 1; i$2 <= 12; i$2++) { keyNames[i$2 + 111] = keyNames[i$2 + 63235] = "F" + i$2; }

	var keyMap = {};

	keyMap.basic = {
	  "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
	  "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
	  "Delete": "delCharAfter", "Backspace": "delCharBefore", "Shift-Backspace": "delCharBefore",
	  "Tab": "defaultTab", "Shift-Tab": "indentAuto",
	  "Enter": "newlineAndIndent", "Insert": "toggleOverwrite",
	  "Esc": "singleSelection"
	};
	// Note that the save and find-related commands aren't defined by
	// default. User code or addons can define them. Unknown commands
	// are simply ignored.
	keyMap.pcDefault = {
	  "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
	  "Ctrl-Home": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Up": "goLineUp", "Ctrl-Down": "goLineDown",
	  "Ctrl-Left": "goGroupLeft", "Ctrl-Right": "goGroupRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
	  "Ctrl-Backspace": "delGroupBefore", "Ctrl-Delete": "delGroupAfter", "Ctrl-S": "save", "Ctrl-F": "find",
	  "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
	  "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
	  "Ctrl-U": "undoSelection", "Shift-Ctrl-U": "redoSelection", "Alt-U": "redoSelection",
	  fallthrough: "basic"
	};
	// Very basic readline/emacs-style bindings, which are standard on Mac.
	keyMap.emacsy = {
	  "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
	  "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
	  "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp", "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore",
	  "Alt-D": "delWordAfter", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars",
	  "Ctrl-O": "openLine"
	};
	keyMap.macDefault = {
	  "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
	  "Cmd-Home": "goDocStart", "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",
	  "Alt-Right": "goGroupRight", "Cmd-Left": "goLineLeft", "Cmd-Right": "goLineRight", "Alt-Backspace": "delGroupBefore",
	  "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",
	  "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
	  "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delWrappedLineLeft", "Cmd-Delete": "delWrappedLineRight",
	  "Cmd-U": "undoSelection", "Shift-Cmd-U": "redoSelection", "Ctrl-Up": "goDocStart", "Ctrl-Down": "goDocEnd",
	  fallthrough: ["basic", "emacsy"]
	};
	keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;

	// KEYMAP DISPATCH

	function normalizeKeyName(name) {
	  var parts = name.split(/-(?!$)/);
	  name = parts[parts.length - 1];
	  var alt, ctrl, shift, cmd;
	  for (var i = 0; i < parts.length - 1; i++) {
	    var mod = parts[i];
	    if (/^(cmd|meta|m)$/i.test(mod)) { cmd = true; }
	    else if (/^a(lt)?$/i.test(mod)) { alt = true; }
	    else if (/^(c|ctrl|control)$/i.test(mod)) { ctrl = true; }
	    else if (/^s(hift)?$/i.test(mod)) { shift = true; }
	    else { throw new Error("Unrecognized modifier name: " + mod) }
	  }
	  if (alt) { name = "Alt-" + name; }
	  if (ctrl) { name = "Ctrl-" + name; }
	  if (cmd) { name = "Cmd-" + name; }
	  if (shift) { name = "Shift-" + name; }
	  return name
	}

	// This is a kludge to keep keymaps mostly working as raw objects
	// (backwards compatibility) while at the same time support features
	// like normalization and multi-stroke key bindings. It compiles a
	// new normalized keymap, and then updates the old object to reflect
	// this.
	function normalizeKeyMap(keymap) {
	  var copy = {};
	  for (var keyname in keymap) { if (keymap.hasOwnProperty(keyname)) {
	    var value = keymap[keyname];
	    if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) { continue }
	    if (value == "...") { delete keymap[keyname]; continue }

	    var keys = map(keyname.split(" "), normalizeKeyName);
	    for (var i = 0; i < keys.length; i++) {
	      var val = (void 0), name = (void 0);
	      if (i == keys.length - 1) {
	        name = keys.join(" ");
	        val = value;
	      } else {
	        name = keys.slice(0, i + 1).join(" ");
	        val = "...";
	      }
	      var prev = copy[name];
	      if (!prev) { copy[name] = val; }
	      else if (prev != val) { throw new Error("Inconsistent bindings for " + name) }
	    }
	    delete keymap[keyname];
	  } }
	  for (var prop in copy) { keymap[prop] = copy[prop]; }
	  return keymap
	}

	function lookupKey(key, map$$1, handle, context) {
	  map$$1 = getKeyMap(map$$1);
	  var found = map$$1.call ? map$$1.call(key, context) : map$$1[key];
	  if (found === false) { return "nothing" }
	  if (found === "...") { return "multi" }
	  if (found != null && handle(found)) { return "handled" }

	  if (map$$1.fallthrough) {
	    if (Object.prototype.toString.call(map$$1.fallthrough) != "[object Array]")
	      { return lookupKey(key, map$$1.fallthrough, handle, context) }
	    for (var i = 0; i < map$$1.fallthrough.length; i++) {
	      var result = lookupKey(key, map$$1.fallthrough[i], handle, context);
	      if (result) { return result }
	    }
	  }
	}

	// Modifier key presses don't count as 'real' key presses for the
	// purpose of keymap fallthrough.
	function isModifierKey(value) {
	  var name = typeof value == "string" ? value : keyNames[value.keyCode];
	  return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod"
	}

	function addModifierNames(name, event, noShift) {
	  var base = name;
	  if (event.altKey && base != "Alt") { name = "Alt-" + name; }
	  if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != "Ctrl") { name = "Ctrl-" + name; }
	  if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != "Cmd") { name = "Cmd-" + name; }
	  if (!noShift && event.shiftKey && base != "Shift") { name = "Shift-" + name; }
	  return name
	}

	// Look up the name of a key as indicated by an event object.
	function keyName(event, noShift) {
	  if (presto && event.keyCode == 34 && event["char"]) { return false }
	  var name = keyNames[event.keyCode];
	  if (name == null || event.altGraphKey) { return false }
	  return addModifierNames(name, event, noShift)
	}

	function getKeyMap(val) {
	  return typeof val == "string" ? keyMap[val] : val
	}

	// Helper for deleting text near the selection(s), used to implement
	// backspace, delete, and similar functionality.
	function deleteNearSelection(cm, compute) {
	  var ranges = cm.doc.sel.ranges, kill = [];
	  // Build up a set of ranges to kill first, merging overlapping
	  // ranges.
	  for (var i = 0; i < ranges.length; i++) {
	    var toKill = compute(ranges[i]);
	    while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
	      var replaced = kill.pop();
	      if (cmp(replaced.from, toKill.from) < 0) {
	        toKill.from = replaced.from;
	        break
	      }
	    }
	    kill.push(toKill);
	  }
	  // Next, remove those actual ranges.
	  runInOp(cm, function () {
	    for (var i = kill.length - 1; i >= 0; i--)
	      { replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete"); }
	    ensureCursorVisible(cm);
	  });
	}

	// Commands are parameter-less actions that can be performed on an
	// editor, mostly used for keybindings.
	var commands = {
	  selectAll: selectAll,
	  singleSelection: function (cm) { return cm.setSelection(cm.getCursor("anchor"), cm.getCursor("head"), sel_dontScroll); },
	  killLine: function (cm) { return deleteNearSelection(cm, function (range) {
	    if (range.empty()) {
	      var len = getLine(cm.doc, range.head.line).text.length;
	      if (range.head.ch == len && range.head.line < cm.lastLine())
	        { return {from: range.head, to: Pos(range.head.line + 1, 0)} }
	      else
	        { return {from: range.head, to: Pos(range.head.line, len)} }
	    } else {
	      return {from: range.from(), to: range.to()}
	    }
	  }); },
	  deleteLine: function (cm) { return deleteNearSelection(cm, function (range) { return ({
	    from: Pos(range.from().line, 0),
	    to: clipPos(cm.doc, Pos(range.to().line + 1, 0))
	  }); }); },
	  delLineLeft: function (cm) { return deleteNearSelection(cm, function (range) { return ({
	    from: Pos(range.from().line, 0), to: range.from()
	  }); }); },
	  delWrappedLineLeft: function (cm) { return deleteNearSelection(cm, function (range) {
	    var top = cm.charCoords(range.head, "div").top + 5;
	    var leftPos = cm.coordsChar({left: 0, top: top}, "div");
	    return {from: leftPos, to: range.from()}
	  }); },
	  delWrappedLineRight: function (cm) { return deleteNearSelection(cm, function (range) {
	    var top = cm.charCoords(range.head, "div").top + 5;
	    var rightPos = cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div");
	    return {from: range.from(), to: rightPos }
	  }); },
	  undo: function (cm) { return cm.undo(); },
	  redo: function (cm) { return cm.redo(); },
	  undoSelection: function (cm) { return cm.undoSelection(); },
	  redoSelection: function (cm) { return cm.redoSelection(); },
	  goDocStart: function (cm) { return cm.extendSelection(Pos(cm.firstLine(), 0)); },
	  goDocEnd: function (cm) { return cm.extendSelection(Pos(cm.lastLine())); },
	  goLineStart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStart(cm, range.head.line); },
	    {origin: "+move", bias: 1}
	  ); },
	  goLineStartSmart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStartSmart(cm, range.head); },
	    {origin: "+move", bias: 1}
	  ); },
	  goLineEnd: function (cm) { return cm.extendSelectionsBy(function (range) { return lineEnd(cm, range.head.line); },
	    {origin: "+move", bias: -1}
	  ); },
	  goLineRight: function (cm) { return cm.extendSelectionsBy(function (range) {
	    var top = cm.cursorCoords(range.head, "div").top + 5;
	    return cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div")
	  }, sel_move); },
	  goLineLeft: function (cm) { return cm.extendSelectionsBy(function (range) {
	    var top = cm.cursorCoords(range.head, "div").top + 5;
	    return cm.coordsChar({left: 0, top: top}, "div")
	  }, sel_move); },
	  goLineLeftSmart: function (cm) { return cm.extendSelectionsBy(function (range) {
	    var top = cm.cursorCoords(range.head, "div").top + 5;
	    var pos = cm.coordsChar({left: 0, top: top}, "div");
	    if (pos.ch < cm.getLine(pos.line).search(/\S/)) { return lineStartSmart(cm, range.head) }
	    return pos
	  }, sel_move); },
	  goLineUp: function (cm) { return cm.moveV(-1, "line"); },
	  goLineDown: function (cm) { return cm.moveV(1, "line"); },
	  goPageUp: function (cm) { return cm.moveV(-1, "page"); },
	  goPageDown: function (cm) { return cm.moveV(1, "page"); },
	  goCharLeft: function (cm) { return cm.moveH(-1, "char"); },
	  goCharRight: function (cm) { return cm.moveH(1, "char"); },
	  goColumnLeft: function (cm) { return cm.moveH(-1, "column"); },
	  goColumnRight: function (cm) { return cm.moveH(1, "column"); },
	  goWordLeft: function (cm) { return cm.moveH(-1, "word"); },
	  goGroupRight: function (cm) { return cm.moveH(1, "group"); },
	  goGroupLeft: function (cm) { return cm.moveH(-1, "group"); },
	  goWordRight: function (cm) { return cm.moveH(1, "word"); },
	  delCharBefore: function (cm) { return cm.deleteH(-1, "char"); },
	  delCharAfter: function (cm) { return cm.deleteH(1, "char"); },
	  delWordBefore: function (cm) { return cm.deleteH(-1, "word"); },
	  delWordAfter: function (cm) { return cm.deleteH(1, "word"); },
	  delGroupBefore: function (cm) { return cm.deleteH(-1, "group"); },
	  delGroupAfter: function (cm) { return cm.deleteH(1, "group"); },
	  indentAuto: function (cm) { return cm.indentSelection("smart"); },
	  indentMore: function (cm) { return cm.indentSelection("add"); },
	  indentLess: function (cm) { return cm.indentSelection("subtract"); },
	  insertTab: function (cm) { return cm.replaceSelection("\t"); },
	  insertSoftTab: function (cm) {
	    var spaces = [], ranges = cm.listSelections(), tabSize = cm.options.tabSize;
	    for (var i = 0; i < ranges.length; i++) {
	      var pos = ranges[i].from();
	      var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize);
	      spaces.push(spaceStr(tabSize - col % tabSize));
	    }
	    cm.replaceSelections(spaces);
	  },
	  defaultTab: function (cm) {
	    if (cm.somethingSelected()) { cm.indentSelection("add"); }
	    else { cm.execCommand("insertTab"); }
	  },
	  // Swap the two chars left and right of each selection's head.
	  // Move cursor behind the two swapped characters afterwards.
	  //
	  // Doesn't consider line feeds a character.
	  // Doesn't scan more than one line above to find a character.
	  // Doesn't do anything on an empty line.
	  // Doesn't do anything with non-empty selections.
	  transposeChars: function (cm) { return runInOp(cm, function () {
	    var ranges = cm.listSelections(), newSel = [];
	    for (var i = 0; i < ranges.length; i++) {
	      if (!ranges[i].empty()) { continue }
	      var cur = ranges[i].head, line = getLine(cm.doc, cur.line).text;
	      if (line) {
	        if (cur.ch == line.length) { cur = new Pos(cur.line, cur.ch - 1); }
	        if (cur.ch > 0) {
	          cur = new Pos(cur.line, cur.ch + 1);
	          cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),
	                          Pos(cur.line, cur.ch - 2), cur, "+transpose");
	        } else if (cur.line > cm.doc.first) {
	          var prev = getLine(cm.doc, cur.line - 1).text;
	          if (prev) {
	            cur = new Pos(cur.line, 1);
	            cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +
	                            prev.charAt(prev.length - 1),
	                            Pos(cur.line - 1, prev.length - 1), cur, "+transpose");
	          }
	        }
	      }
	      newSel.push(new Range(cur, cur));
	    }
	    cm.setSelections(newSel);
	  }); },
	  newlineAndIndent: function (cm) { return runInOp(cm, function () {
	    var sels = cm.listSelections();
	    for (var i = sels.length - 1; i >= 0; i--)
	      { cm.replaceRange(cm.doc.lineSeparator(), sels[i].anchor, sels[i].head, "+input"); }
	    sels = cm.listSelections();
	    for (var i$1 = 0; i$1 < sels.length; i$1++)
	      { cm.indentLine(sels[i$1].from().line, null, true); }
	    ensureCursorVisible(cm);
	  }); },
	  openLine: function (cm) { return cm.replaceSelection("\n", "start"); },
	  toggleOverwrite: function (cm) { return cm.toggleOverwrite(); }
	};


	function lineStart(cm, lineN) {
	  var line = getLine(cm.doc, lineN);
	  var visual = visualLine(line);
	  if (visual != line) { lineN = lineNo(visual); }
	  return endOfLine(true, cm, visual, lineN, 1)
	}
	function lineEnd(cm, lineN) {
	  var line = getLine(cm.doc, lineN);
	  var visual = visualLineEnd(line);
	  if (visual != line) { lineN = lineNo(visual); }
	  return endOfLine(true, cm, line, lineN, -1)
	}
	function lineStartSmart(cm, pos) {
	  var start = lineStart(cm, pos.line);
	  var line = getLine(cm.doc, start.line);
	  var order = getOrder(line, cm.doc.direction);
	  if (!order || order[0].level == 0) {
	    var firstNonWS = Math.max(0, line.text.search(/\S/));
	    var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch;
	    return Pos(start.line, inWS ? 0 : firstNonWS, start.sticky)
	  }
	  return start
	}

	// Run a handler that was bound to a key.
	function doHandleBinding(cm, bound, dropShift) {
	  if (typeof bound == "string") {
	    bound = commands[bound];
	    if (!bound) { return false }
	  }
	  // Ensure previous input has been read, so that the handler sees a
	  // consistent view of the document
	  cm.display.input.ensurePolled();
	  var prevShift = cm.display.shift, done = false;
	  try {
	    if (cm.isReadOnly()) { cm.state.suppressEdits = true; }
	    if (dropShift) { cm.display.shift = false; }
	    done = bound(cm) != Pass;
	  } finally {
	    cm.display.shift = prevShift;
	    cm.state.suppressEdits = false;
	  }
	  return done
	}

	function lookupKeyForEditor(cm, name, handle) {
	  for (var i = 0; i < cm.state.keyMaps.length; i++) {
	    var result = lookupKey(name, cm.state.keyMaps[i], handle, cm);
	    if (result) { return result }
	  }
	  return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm))
	    || lookupKey(name, cm.options.keyMap, handle, cm)
	}

	// Note that, despite the name, this function is also used to check
	// for bound mouse clicks.

	var stopSeq = new Delayed;
	function dispatchKey(cm, name, e, handle) {
	  var seq = cm.state.keySeq;
	  if (seq) {
	    if (isModifierKey(name)) { return "handled" }
	    stopSeq.set(50, function () {
	      if (cm.state.keySeq == seq) {
	        cm.state.keySeq = null;
	        cm.display.input.reset();
	      }
	    });
	    name = seq + " " + name;
	  }
	  var result = lookupKeyForEditor(cm, name, handle);

	  if (result == "multi")
	    { cm.state.keySeq = name; }
	  if (result == "handled")
	    { signalLater(cm, "keyHandled", cm, name, e); }

	  if (result == "handled" || result == "multi") {
	    e_preventDefault(e);
	    restartBlink(cm);
	  }

	  if (seq && !result && /\'$/.test(name)) {
	    e_preventDefault(e);
	    return true
	  }
	  return !!result
	}

	// Handle a key from the keydown event.
	function handleKeyBinding(cm, e) {
	  var name = keyName(e, true);
	  if (!name) { return false }

	  if (e.shiftKey && !cm.state.keySeq) {
	    // First try to resolve full name (including 'Shift-'). Failing
	    // that, see if there is a cursor-motion command (starting with
	    // 'go') bound to the keyname without 'Shift-'.
	    return dispatchKey(cm, "Shift-" + name, e, function (b) { return doHandleBinding(cm, b, true); })
	        || dispatchKey(cm, name, e, function (b) {
	             if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion)
	               { return doHandleBinding(cm, b) }
	           })
	  } else {
	    return dispatchKey(cm, name, e, function (b) { return doHandleBinding(cm, b); })
	  }
	}

	// Handle a key from the keypress event
	function handleCharBinding(cm, e, ch) {
	  return dispatchKey(cm, "'" + ch + "'", e, function (b) { return doHandleBinding(cm, b, true); })
	}

	var lastStoppedKey = null;
	function onKeyDown(e) {
	  var cm = this;
	  cm.curOp.focus = activeElt();
	  if (signalDOMEvent(cm, e)) { return }
	  // IE does strange things with escape.
	  if (ie && ie_version < 11 && e.keyCode == 27) { e.returnValue = false; }
	  var code = e.keyCode;
	  cm.display.shift = code == 16 || e.shiftKey;
	  var handled = handleKeyBinding(cm, e);
	  if (presto) {
	    lastStoppedKey = handled ? code : null;
	    // Opera has no cut event... we try to at least catch the key combo
	    if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))
	      { cm.replaceSelection("", null, "cut"); }
	  }

	  // Turn mouse into crosshair when Alt is held on Mac.
	  if (code == 18 && !/\bCodeMirror-crosshair\b/.test(cm.display.lineDiv.className))
	    { showCrossHair(cm); }
	}

	function showCrossHair(cm) {
	  var lineDiv = cm.display.lineDiv;
	  addClass(lineDiv, "CodeMirror-crosshair");

	  function up(e) {
	    if (e.keyCode == 18 || !e.altKey) {
	      rmClass(lineDiv, "CodeMirror-crosshair");
	      off(document, "keyup", up);
	      off(document, "mouseover", up);
	    }
	  }
	  on(document, "keyup", up);
	  on(document, "mouseover", up);
	}

	function onKeyUp(e) {
	  if (e.keyCode == 16) { this.doc.sel.shift = false; }
	  signalDOMEvent(this, e);
	}

	function onKeyPress(e) {
	  var cm = this;
	  if (eventInWidget(cm.display, e) || signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) { return }
	  var keyCode = e.keyCode, charCode = e.charCode;
	  if (presto && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return}
	  if ((presto && (!e.which || e.which < 10)) && handleKeyBinding(cm, e)) { return }
	  var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
	  // Some browsers fire keypress events for backspace
	  if (ch == "\x08") { return }
	  if (handleCharBinding(cm, e, ch)) { return }
	  cm.display.input.onKeyPress(e);
	}

	var DOUBLECLICK_DELAY = 400;

	var PastClick = function(time, pos, button) {
	  this.time = time;
	  this.pos = pos;
	  this.button = button;
	};

	PastClick.prototype.compare = function (time, pos, button) {
	  return this.time + DOUBLECLICK_DELAY > time &&
	    cmp(pos, this.pos) == 0 && button == this.button
	};

	var lastClick;
	var lastDoubleClick;
	function clickRepeat(pos, button) {
	  var now = +new Date;
	  if (lastDoubleClick && lastDoubleClick.compare(now, pos, button)) {
	    lastClick = lastDoubleClick = null;
	    return "triple"
	  } else if (lastClick && lastClick.compare(now, pos, button)) {
	    lastDoubleClick = new PastClick(now, pos, button);
	    lastClick = null;
	    return "double"
	  } else {
	    lastClick = new PastClick(now, pos, button);
	    lastDoubleClick = null;
	    return "single"
	  }
	}

	// A mouse down can be a single click, double click, triple click,
	// start of selection drag, start of text drag, new cursor
	// (ctrl-click), rectangle drag (alt-drag), or xwin
	// middle-click-paste. Or it might be a click on something we should
	// not interfere with, such as a scrollbar or widget.
	function onMouseDown(e) {
	  var cm = this, display = cm.display;
	  if (signalDOMEvent(cm, e) || display.activeTouch && display.input.supportsTouch()) { return }
	  display.input.ensurePolled();
	  display.shift = e.shiftKey;

	  if (eventInWidget(display, e)) {
	    if (!webkit) {
	      // Briefly turn off draggability, to allow widgets to do
	      // normal dragging things.
	      display.scroller.draggable = false;
	      setTimeout(function () { return display.scroller.draggable = true; }, 100);
	    }
	    return
	  }
	  if (clickInGutter(cm, e)) { return }
	  var pos = posFromMouse(cm, e), button = e_button(e), repeat = pos ? clickRepeat(pos, button) : "single";
	  window.focus();

	  // #3261: make sure, that we're not starting a second selection
	  if (button == 1 && cm.state.selectingText)
	    { cm.state.selectingText(e); }

	  if (pos && handleMappedButton(cm, button, pos, repeat, e)) { return }

	  if (button == 1) {
	    if (pos) { leftButtonDown(cm, pos, repeat, e); }
	    else if (e_target(e) == display.scroller) { e_preventDefault(e); }
	  } else if (button == 2) {
	    if (pos) { extendSelection(cm.doc, pos); }
	    setTimeout(function () { return display.input.focus(); }, 20);
	  } else if (button == 3) {
	    if (captureRightClick) { onContextMenu(cm, e); }
	    else { delayBlurEvent(cm); }
	  }
	}

	function handleMappedButton(cm, button, pos, repeat, event) {
	  var name = "Click";
	  if (repeat == "double") { name = "Double" + name; }
	  else if (repeat == "triple") { name = "Triple" + name; }
	  name = (button == 1 ? "Left" : button == 2 ? "Middle" : "Right") + name;

	  return dispatchKey(cm,  addModifierNames(name, event), event, function (bound) {
	    if (typeof bound == "string") { bound = commands[bound]; }
	    if (!bound) { return false }
	    var done = false;
	    try {
	      if (cm.isReadOnly()) { cm.state.suppressEdits = true; }
	      done = bound(cm, pos) != Pass;
	    } finally {
	      cm.state.suppressEdits = false;
	    }
	    return done
	  })
	}

	function configureMouse(cm, repeat, event) {
	  var option = cm.getOption("configureMouse");
	  var value = option ? option(cm, repeat, event) : {};
	  if (value.unit == null) {
	    var rect = chromeOS ? event.shiftKey && event.metaKey : event.altKey;
	    value.unit = rect ? "rectangle" : repeat == "single" ? "char" : repeat == "double" ? "word" : "line";
	  }
	  if (value.extend == null || cm.doc.extend) { value.extend = cm.doc.extend || event.shiftKey; }
	  if (value.addNew == null) { value.addNew = mac ? event.metaKey : event.ctrlKey; }
	  if (value.moveOnDrag == null) { value.moveOnDrag = !(mac ? event.altKey : event.ctrlKey); }
	  return value
	}

	function leftButtonDown(cm, pos, repeat, event) {
	  if (ie) { setTimeout(bind(ensureFocus, cm), 0); }
	  else { cm.curOp.focus = activeElt(); }

	  var behavior = configureMouse(cm, repeat, event);

	  var sel = cm.doc.sel, contained;
	  if (cm.options.dragDrop && dragAndDrop && !cm.isReadOnly() &&
	      repeat == "single" && (contained = sel.contains(pos)) > -1 &&
	      (cmp((contained = sel.ranges[contained]).from(), pos) < 0 || pos.xRel > 0) &&
	      (cmp(contained.to(), pos) > 0 || pos.xRel < 0))
	    { leftButtonStartDrag(cm, event, pos, behavior); }
	  else
	    { leftButtonSelect(cm, event, pos, behavior); }
	}

	// Start a text drag. When it ends, see if any dragging actually
	// happen, and treat as a click if it didn't.
	function leftButtonStartDrag(cm, event, pos, behavior) {
	  var display = cm.display, moved = false;
	  var dragEnd = operation(cm, function (e) {
	    if (webkit) { display.scroller.draggable = false; }
	    cm.state.draggingText = false;
	    off(document, "mouseup", dragEnd);
	    off(document, "mousemove", mouseMove);
	    off(display.scroller, "dragstart", dragStart);
	    off(display.scroller, "drop", dragEnd);
	    if (!moved) {
	      e_preventDefault(e);
	      if (!behavior.addNew)
	        { extendSelection(cm.doc, pos, null, null, behavior.extend); }
	      // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)
	      if (webkit || ie && ie_version == 9)
	        { setTimeout(function () {document.body.focus(); display.input.focus();}, 20); }
	      else
	        { display.input.focus(); }
	    }
	  });
	  var mouseMove = function(e2) {
	    moved = moved || Math.abs(event.clientX - e2.clientX) + Math.abs(event.clientY - e2.clientY) >= 10;
	  };
	  var dragStart = function () { return moved = true; };
	  // Let the drag handler handle this.
	  if (webkit) { display.scroller.draggable = true; }
	  cm.state.draggingText = dragEnd;
	  dragEnd.copy = !behavior.moveOnDrag;
	  // IE's approach to draggable
	  if (display.scroller.dragDrop) { display.scroller.dragDrop(); }
	  on(document, "mouseup", dragEnd);
	  on(document, "mousemove", mouseMove);
	  on(display.scroller, "dragstart", dragStart);
	  on(display.scroller, "drop", dragEnd);

	  delayBlurEvent(cm);
	  setTimeout(function () { return display.input.focus(); }, 20);
	}

	function rangeForUnit(cm, pos, unit) {
	  if (unit == "char") { return new Range(pos, pos) }
	  if (unit == "word") { return cm.findWordAt(pos) }
	  if (unit == "line") { return new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))) }
	  var result = unit(cm, pos);
	  return new Range(result.from, result.to)
	}

	// Normal selection, as opposed to text dragging.
	function leftButtonSelect(cm, event, start, behavior) {
	  var display = cm.display, doc = cm.doc;
	  e_preventDefault(event);

	  var ourRange, ourIndex, startSel = doc.sel, ranges = startSel.ranges;
	  if (behavior.addNew && !behavior.extend) {
	    ourIndex = doc.sel.contains(start);
	    if (ourIndex > -1)
	      { ourRange = ranges[ourIndex]; }
	    else
	      { ourRange = new Range(start, start); }
	  } else {
	    ourRange = doc.sel.primary();
	    ourIndex = doc.sel.primIndex;
	  }

	  if (behavior.unit == "rectangle") {
	    if (!behavior.addNew) { ourRange = new Range(start, start); }
	    start = posFromMouse(cm, event, true, true);
	    ourIndex = -1;
	  } else {
	    var range$$1 = rangeForUnit(cm, start, behavior.unit);
	    if (behavior.extend)
	      { ourRange = extendRange(ourRange, range$$1.anchor, range$$1.head, behavior.extend); }
	    else
	      { ourRange = range$$1; }
	  }

	  if (!behavior.addNew) {
	    ourIndex = 0;
	    setSelection(doc, new Selection([ourRange], 0), sel_mouse);
	    startSel = doc.sel;
	  } else if (ourIndex == -1) {
	    ourIndex = ranges.length;
	    setSelection(doc, normalizeSelection(ranges.concat([ourRange]), ourIndex),
	                 {scroll: false, origin: "*mouse"});
	  } else if (ranges.length > 1 && ranges[ourIndex].empty() && behavior.unit == "char" && !behavior.extend) {
	    setSelection(doc, normalizeSelection(ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0),
	                 {scroll: false, origin: "*mouse"});
	    startSel = doc.sel;
	  } else {
	    replaceOneSelection(doc, ourIndex, ourRange, sel_mouse);
	  }

	  var lastPos = start;
	  function extendTo(pos) {
	    if (cmp(lastPos, pos) == 0) { return }
	    lastPos = pos;

	    if (behavior.unit == "rectangle") {
	      var ranges = [], tabSize = cm.options.tabSize;
	      var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize);
	      var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize);
	      var left = Math.min(startCol, posCol), right = Math.max(startCol, posCol);
	      for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));
	           line <= end; line++) {
	        var text = getLine(doc, line).text, leftPos = findColumn(text, left, tabSize);
	        if (left == right)
	          { ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos))); }
	        else if (text.length > leftPos)
	          { ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize)))); }
	      }
	      if (!ranges.length) { ranges.push(new Range(start, start)); }
	      setSelection(doc, normalizeSelection(startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex),
	                   {origin: "*mouse", scroll: false});
	      cm.scrollIntoView(pos);
	    } else {
	      var oldRange = ourRange;
	      var range$$1 = rangeForUnit(cm, pos, behavior.unit);
	      var anchor = oldRange.anchor, head;
	      if (cmp(range$$1.anchor, anchor) > 0) {
	        head = range$$1.head;
	        anchor = minPos(oldRange.from(), range$$1.anchor);
	      } else {
	        head = range$$1.anchor;
	        anchor = maxPos(oldRange.to(), range$$1.head);
	      }
	      var ranges$1 = startSel.ranges.slice(0);
	      ranges$1[ourIndex] = new Range(clipPos(doc, anchor), head);
	      setSelection(doc, normalizeSelection(ranges$1, ourIndex), sel_mouse);
	    }
	  }

	  var editorSize = display.wrapper.getBoundingClientRect();
	  // Used to ensure timeout re-tries don't fire when another extend
	  // happened in the meantime (clearTimeout isn't reliable -- at
	  // least on Chrome, the timeouts still happen even when cleared,
	  // if the clear happens after their scheduled firing time).
	  var counter = 0;

	  function extend(e) {
	    var curCount = ++counter;
	    var cur = posFromMouse(cm, e, true, behavior.unit == "rectangle");
	    if (!cur) { return }
	    if (cmp(cur, lastPos) != 0) {
	      cm.curOp.focus = activeElt();
	      extendTo(cur);
	      var visible = visibleLines(display, doc);
	      if (cur.line >= visible.to || cur.line < visible.from)
	        { setTimeout(operation(cm, function () {if (counter == curCount) { extend(e); }}), 150); }
	    } else {
	      var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;
	      if (outside) { setTimeout(operation(cm, function () {
	        if (counter != curCount) { return }
	        display.scroller.scrollTop += outside;
	        extend(e);
	      }), 50); }
	    }
	  }

	  function done(e) {
	    cm.state.selectingText = false;
	    counter = Infinity;
	    e_preventDefault(e);
	    display.input.focus();
	    off(document, "mousemove", move);
	    off(document, "mouseup", up);
	    doc.history.lastSelOrigin = null;
	  }

	  var move = operation(cm, function (e) {
	    if (!e_button(e)) { done(e); }
	    else { extend(e); }
	  });
	  var up = operation(cm, done);
	  cm.state.selectingText = up;
	  on(document, "mousemove", move);
	  on(document, "mouseup", up);
	}


	// Determines whether an event happened in the gutter, and fires the
	// handlers for the corresponding event.
	function gutterEvent(cm, e, type, prevent) {
	  var mX, mY;
	  try { mX = e.clientX; mY = e.clientY; }
	  catch(e) { return false }
	  if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) { return false }
	  if (prevent) { e_preventDefault(e); }

	  var display = cm.display;
	  var lineBox = display.lineDiv.getBoundingClientRect();

	  if (mY > lineBox.bottom || !hasHandler(cm, type)) { return e_defaultPrevented(e) }
	  mY -= lineBox.top - display.viewOffset;

	  for (var i = 0; i < cm.options.gutters.length; ++i) {
	    var g = display.gutters.childNodes[i];
	    if (g && g.getBoundingClientRect().right >= mX) {
	      var line = lineAtHeight(cm.doc, mY);
	      var gutter = cm.options.gutters[i];
	      signal(cm, type, cm, line, gutter, e);
	      return e_defaultPrevented(e)
	    }
	  }
	}

	function clickInGutter(cm, e) {
	  return gutterEvent(cm, e, "gutterClick", true)
	}

	// CONTEXT MENU HANDLING

	// To make the context menu work, we need to briefly unhide the
	// textarea (making it as unobtrusive as possible) to let the
	// right-click take effect on it.
	function onContextMenu(cm, e) {
	  if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) { return }
	  if (signalDOMEvent(cm, e, "contextmenu")) { return }
	  cm.display.input.onContextMenu(e);
	}

	function contextMenuInGutter(cm, e) {
	  if (!hasHandler(cm, "gutterContextMenu")) { return false }
	  return gutterEvent(cm, e, "gutterContextMenu", false)
	}

	function themeChanged(cm) {
	  cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
	    cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-");
	  clearCaches(cm);
	}

	var Init = {toString: function(){return "CodeMirror.Init"}};

	var defaults = {};
	var optionHandlers = {};

	function defineOptions(CodeMirror) {
	  var optionHandlers = CodeMirror.optionHandlers;

	  function option(name, deflt, handle, notOnInit) {
	    CodeMirror.defaults[name] = deflt;
	    if (handle) { optionHandlers[name] =
	      notOnInit ? function (cm, val, old) {if (old != Init) { handle(cm, val, old); }} : handle; }
	  }

	  CodeMirror.defineOption = option;

	  // Passed to option handlers when there is no old value.
	  CodeMirror.Init = Init;

	  // These two are, on init, called from the constructor because they
	  // have to be initialized before the editor can start at all.
	  option("value", "", function (cm, val) { return cm.setValue(val); }, true);
	  option("mode", null, function (cm, val) {
	    cm.doc.modeOption = val;
	    loadMode(cm);
	  }, true);

	  option("indentUnit", 2, loadMode, true);
	  option("indentWithTabs", false);
	  option("smartIndent", true);
	  option("tabSize", 4, function (cm) {
	    resetModeState(cm);
	    clearCaches(cm);
	    regChange(cm);
	  }, true);
	  option("lineSeparator", null, function (cm, val) {
	    cm.doc.lineSep = val;
	    if (!val) { return }
	    var newBreaks = [], lineNo = cm.doc.first;
	    cm.doc.iter(function (line) {
	      for (var pos = 0;;) {
	        var found = line.text.indexOf(val, pos);
	        if (found == -1) { break }
	        pos = found + val.length;
	        newBreaks.push(Pos(lineNo, found));
	      }
	      lineNo++;
	    });
	    for (var i = newBreaks.length - 1; i >= 0; i--)
	      { replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length)); }
	  });
	  option("specialChars", /[\u0000-\u001f\u007f-\u009f\u00ad\u061c\u200b-\u200f\u2028\u2029\ufeff]/g, function (cm, val, old) {
	    cm.state.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "|\t"), "g");
	    if (old != Init) { cm.refresh(); }
	  });
	  option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function (cm) { return cm.refresh(); }, true);
	  option("electricChars", true);
	  option("inputStyle", mobile ? "contenteditable" : "textarea", function () {
	    throw new Error("inputStyle can not (yet) be changed in a running editor") // FIXME
	  }, true);
	  option("spellcheck", false, function (cm, val) { return cm.getInputField().spellcheck = val; }, true);
	  option("rtlMoveVisually", !windows);
	  option("wholeLineUpdateBefore", true);

	  option("theme", "default", function (cm) {
	    themeChanged(cm);
	    guttersChanged(cm);
	  }, true);
	  option("keyMap", "default", function (cm, val, old) {
	    var next = getKeyMap(val);
	    var prev = old != Init && getKeyMap(old);
	    if (prev && prev.detach) { prev.detach(cm, next); }
	    if (next.attach) { next.attach(cm, prev || null); }
	  });
	  option("extraKeys", null);
	  option("configureMouse", null);

	  option("lineWrapping", false, wrappingChanged, true);
	  option("gutters", [], function (cm) {
	    setGuttersForLineNumbers(cm.options);
	    guttersChanged(cm);
	  }, true);
	  option("fixedGutter", true, function (cm, val) {
	    cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0";
	    cm.refresh();
	  }, true);
	  option("coverGutterNextToScrollbar", false, function (cm) { return updateScrollbars(cm); }, true);
	  option("scrollbarStyle", "native", function (cm) {
	    initScrollbars(cm);
	    updateScrollbars(cm);
	    cm.display.scrollbars.setScrollTop(cm.doc.scrollTop);
	    cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft);
	  }, true);
	  option("lineNumbers", false, function (cm) {
	    setGuttersForLineNumbers(cm.options);
	    guttersChanged(cm);
	  }, true);
	  option("firstLineNumber", 1, guttersChanged, true);
	  option("lineNumberFormatter", function (integer) { return integer; }, guttersChanged, true);
	  option("showCursorWhenSelecting", false, updateSelection, true);

	  option("resetSelectionOnContextMenu", true);
	  option("lineWiseCopyCut", true);
	  option("pasteLinesPerSelection", true);

	  option("readOnly", false, function (cm, val) {
	    if (val == "nocursor") {
	      onBlur(cm);
	      cm.display.input.blur();
	    }
	    cm.display.input.readOnlyChanged(val);
	  });
	  option("disableInput", false, function (cm, val) {if (!val) { cm.display.input.reset(); }}, true);
	  option("dragDrop", true, dragDropChanged);
	  option("allowDropFileTypes", null);

	  option("cursorBlinkRate", 530);
	  option("cursorScrollMargin", 0);
	  option("cursorHeight", 1, updateSelection, true);
	  option("singleCursorHeightPerLine", true, updateSelection, true);
	  option("workTime", 100);
	  option("workDelay", 100);
	  option("flattenSpans", true, resetModeState, true);
	  option("addModeClass", false, resetModeState, true);
	  option("pollInterval", 100);
	  option("undoDepth", 200, function (cm, val) { return cm.doc.history.undoDepth = val; });
	  option("historyEventDelay", 1250);
	  option("viewportMargin", 10, function (cm) { return cm.refresh(); }, true);
	  option("maxHighlightLength", 10000, resetModeState, true);
	  option("moveInputWithCursor", true, function (cm, val) {
	    if (!val) { cm.display.input.resetPosition(); }
	  });

	  option("tabindex", null, function (cm, val) { return cm.display.input.getField().tabIndex = val || ""; });
	  option("autofocus", null);
	  option("direction", "ltr", function (cm, val) { return cm.doc.setDirection(val); }, true);
	}

	function guttersChanged(cm) {
	  updateGutters(cm);
	  regChange(cm);
	  alignHorizontally(cm);
	}

	function dragDropChanged(cm, value, old) {
	  var wasOn = old && old != Init;
	  if (!value != !wasOn) {
	    var funcs = cm.display.dragFunctions;
	    var toggle = value ? on : off;
	    toggle(cm.display.scroller, "dragstart", funcs.start);
	    toggle(cm.display.scroller, "dragenter", funcs.enter);
	    toggle(cm.display.scroller, "dragover", funcs.over);
	    toggle(cm.display.scroller, "dragleave", funcs.leave);
	    toggle(cm.display.scroller, "drop", funcs.drop);
	  }
	}

	function wrappingChanged(cm) {
	  if (cm.options.lineWrapping) {
	    addClass(cm.display.wrapper, "CodeMirror-wrap");
	    cm.display.sizer.style.minWidth = "";
	    cm.display.sizerWidth = null;
	  } else {
	    rmClass(cm.display.wrapper, "CodeMirror-wrap");
	    findMaxLine(cm);
	  }
	  estimateLineHeights(cm);
	  regChange(cm);
	  clearCaches(cm);
	  setTimeout(function () { return updateScrollbars(cm); }, 100);
	}

	// A CodeMirror instance represents an editor. This is the object
	// that user code is usually dealing with.

	function CodeMirror$1(place, options) {
	  var this$1 = this;

	  if (!(this instanceof CodeMirror$1)) { return new CodeMirror$1(place, options) }

	  this.options = options = options ? copyObj(options) : {};
	  // Determine effective options based on given values and defaults.
	  copyObj(defaults, options, false);
	  setGuttersForLineNumbers(options);

	  var doc = options.value;
	  if (typeof doc == "string") { doc = new Doc(doc, options.mode, null, options.lineSeparator, options.direction); }
	  this.doc = doc;

	  var input = new CodeMirror$1.inputStyles[options.inputStyle](this);
	  var display = this.display = new Display(place, doc, input);
	  display.wrapper.CodeMirror = this;
	  updateGutters(this);
	  themeChanged(this);
	  if (options.lineWrapping)
	    { this.display.wrapper.className += " CodeMirror-wrap"; }
	  initScrollbars(this);

	  this.state = {
	    keyMaps: [],  // stores maps added by addKeyMap
	    overlays: [], // highlighting overlays, as added by addOverlay
	    modeGen: 0,   // bumped when mode/overlay changes, used to invalidate highlighting info
	    overwrite: false,
	    delayingBlurEvent: false,
	    focused: false,
	    suppressEdits: false, // used to disable editing during key handlers when in readOnly mode
	    pasteIncoming: false, cutIncoming: false, // help recognize paste/cut edits in input.poll
	    selectingText: false,
	    draggingText: false,
	    highlight: new Delayed(), // stores highlight worker timeout
	    keySeq: null,  // Unfinished key sequence
	    specialChars: null
	  };

	  if (options.autofocus && !mobile) { display.input.focus(); }

	  // Override magic textarea content restore that IE sometimes does
	  // on our hidden textarea on reload
	  if (ie && ie_version < 11) { setTimeout(function () { return this$1.display.input.reset(true); }, 20); }

	  registerEventHandlers(this);
	  ensureGlobalHandlers();

	  startOperation(this);
	  this.curOp.forceUpdate = true;
	  attachDoc(this, doc);

	  if ((options.autofocus && !mobile) || this.hasFocus())
	    { setTimeout(bind(onFocus, this), 20); }
	  else
	    { onBlur(this); }

	  for (var opt in optionHandlers) { if (optionHandlers.hasOwnProperty(opt))
	    { optionHandlers[opt](this$1, options[opt], Init); } }
	  maybeUpdateLineNumberWidth(this);
	  if (options.finishInit) { options.finishInit(this); }
	  for (var i = 0; i < initHooks.length; ++i) { initHooks[i](this$1); }
	  endOperation(this);
	  // Suppress optimizelegibility in Webkit, since it breaks text
	  // measuring on line wrapping boundaries.
	  if (webkit && options.lineWrapping &&
	      getComputedStyle(display.lineDiv).textRendering == "optimizelegibility")
	    { display.lineDiv.style.textRendering = "auto"; }
	}

	// The default configuration options.
	CodeMirror$1.defaults = defaults;
	// Functions to run when options are changed.
	CodeMirror$1.optionHandlers = optionHandlers;

	// Attach the necessary event handlers when initializing the editor
	function registerEventHandlers(cm) {
	  var d = cm.display;
	  on(d.scroller, "mousedown", operation(cm, onMouseDown));
	  // Older IE's will not fire a second mousedown for a double click
	  if (ie && ie_version < 11)
	    { on(d.scroller, "dblclick", operation(cm, function (e) {
	      if (signalDOMEvent(cm, e)) { return }
	      var pos = posFromMouse(cm, e);
	      if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) { return }
	      e_preventDefault(e);
	      var word = cm.findWordAt(pos);
	      extendSelection(cm.doc, word.anchor, word.head);
	    })); }
	  else
	    { on(d.scroller, "dblclick", function (e) { return signalDOMEvent(cm, e) || e_preventDefault(e); }); }
	  // Some browsers fire contextmenu *after* opening the menu, at
	  // which point we can't mess with it anymore. Context menu is
	  // handled in onMouseDown for these browsers.
	  if (!captureRightClick) { on(d.scroller, "contextmenu", function (e) { return onContextMenu(cm, e); }); }

	  // Used to suppress mouse event handling when a touch happens
	  var touchFinished, prevTouch = {end: 0};
	  function finishTouch() {
	    if (d.activeTouch) {
	      touchFinished = setTimeout(function () { return d.activeTouch = null; }, 1000);
	      prevTouch = d.activeTouch;
	      prevTouch.end = +new Date;
	    }
	  }
	  function isMouseLikeTouchEvent(e) {
	    if (e.touches.length != 1) { return false }
	    var touch = e.touches[0];
	    return touch.radiusX <= 1 && touch.radiusY <= 1
	  }
	  function farAway(touch, other) {
	    if (other.left == null) { return true }
	    var dx = other.left - touch.left, dy = other.top - touch.top;
	    return dx * dx + dy * dy > 20 * 20
	  }
	  on(d.scroller, "touchstart", function (e) {
	    if (!signalDOMEvent(cm, e) && !isMouseLikeTouchEvent(e)) {
	      d.input.ensurePolled();
	      clearTimeout(touchFinished);
	      var now = +new Date;
	      d.activeTouch = {start: now, moved: false,
	                       prev: now - prevTouch.end <= 300 ? prevTouch : null};
	      if (e.touches.length == 1) {
	        d.activeTouch.left = e.touches[0].pageX;
	        d.activeTouch.top = e.touches[0].pageY;
	      }
	    }
	  });
	  on(d.scroller, "touchmove", function () {
	    if (d.activeTouch) { d.activeTouch.moved = true; }
	  });
	  on(d.scroller, "touchend", function (e) {
	    var touch = d.activeTouch;
	    if (touch && !eventInWidget(d, e) && touch.left != null &&
	        !touch.moved && new Date - touch.start < 300) {
	      var pos = cm.coordsChar(d.activeTouch, "page"), range;
	      if (!touch.prev || farAway(touch, touch.prev)) // Single tap
	        { range = new Range(pos, pos); }
	      else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) // Double tap
	        { range = cm.findWordAt(pos); }
	      else // Triple tap
	        { range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))); }
	      cm.setSelection(range.anchor, range.head);
	      cm.focus();
	      e_preventDefault(e);
	    }
	    finishTouch();
	  });
	  on(d.scroller, "touchcancel", finishTouch);

	  // Sync scrolling between fake scrollbars and real scrollable
	  // area, ensure viewport is updated when scrolling.
	  on(d.scroller, "scroll", function () {
	    if (d.scroller.clientHeight) {
	      updateScrollTop(cm, d.scroller.scrollTop);
	      setScrollLeft(cm, d.scroller.scrollLeft, true);
	      signal(cm, "scroll", cm);
	    }
	  });

	  // Listen to wheel events in order to try and update the viewport on time.
	  on(d.scroller, "mousewheel", function (e) { return onScrollWheel(cm, e); });
	  on(d.scroller, "DOMMouseScroll", function (e) { return onScrollWheel(cm, e); });

	  // Prevent wrapper from ever scrolling
	  on(d.wrapper, "scroll", function () { return d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; });

	  d.dragFunctions = {
	    enter: function (e) {if (!signalDOMEvent(cm, e)) { e_stop(e); }},
	    over: function (e) {if (!signalDOMEvent(cm, e)) { onDragOver(cm, e); e_stop(e); }},
	    start: function (e) { return onDragStart(cm, e); },
	    drop: operation(cm, onDrop),
	    leave: function (e) {if (!signalDOMEvent(cm, e)) { clearDragCursor(cm); }}
	  };

	  var inp = d.input.getField();
	  on(inp, "keyup", function (e) { return onKeyUp.call(cm, e); });
	  on(inp, "keydown", operation(cm, onKeyDown));
	  on(inp, "keypress", operation(cm, onKeyPress));
	  on(inp, "focus", function (e) { return onFocus(cm, e); });
	  on(inp, "blur", function (e) { return onBlur(cm, e); });
	}

	var initHooks = [];
	CodeMirror$1.defineInitHook = function (f) { return initHooks.push(f); };

	// Indent the given line. The how parameter can be "smart",
	// "add"/null, "subtract", or "prev". When aggressive is false
	// (typically set to true for forced single-line indents), empty
	// lines are not indented, and places where the mode returns Pass
	// are left alone.
	function indentLine(cm, n, how, aggressive) {
	  var doc = cm.doc, state;
	  if (how == null) { how = "add"; }
	  if (how == "smart") {
	    // Fall back to "prev" when the mode doesn't have an indentation
	    // method.
	    if (!doc.mode.indent) { how = "prev"; }
	    else { state = getContextBefore(cm, n).state; }
	  }

	  var tabSize = cm.options.tabSize;
	  var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize);
	  if (line.stateAfter) { line.stateAfter = null; }
	  var curSpaceString = line.text.match(/^\s*/)[0], indentation;
	  if (!aggressive && !/\S/.test(line.text)) {
	    indentation = 0;
	    how = "not";
	  } else if (how == "smart") {
	    indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);
	    if (indentation == Pass || indentation > 150) {
	      if (!aggressive) { return }
	      how = "prev";
	    }
	  }
	  if (how == "prev") {
	    if (n > doc.first) { indentation = countColumn(getLine(doc, n-1).text, null, tabSize); }
	    else { indentation = 0; }
	  } else if (how == "add") {
	    indentation = curSpace + cm.options.indentUnit;
	  } else if (how == "subtract") {
	    indentation = curSpace - cm.options.indentUnit;
	  } else if (typeof how == "number") {
	    indentation = curSpace + how;
	  }
	  indentation = Math.max(0, indentation);

	  var indentString = "", pos = 0;
	  if (cm.options.indentWithTabs)
	    { for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t";} }
	  if (pos < indentation) { indentString += spaceStr(indentation - pos); }

	  if (indentString != curSpaceString) {
	    replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
	    line.stateAfter = null;
	    return true
	  } else {
	    // Ensure that, if the cursor was in the whitespace at the start
	    // of the line, it is moved to the end of that space.
	    for (var i$1 = 0; i$1 < doc.sel.ranges.length; i$1++) {
	      var range = doc.sel.ranges[i$1];
	      if (range.head.line == n && range.head.ch < curSpaceString.length) {
	        var pos$1 = Pos(n, curSpaceString.length);
	        replaceOneSelection(doc, i$1, new Range(pos$1, pos$1));
	        break
	      }
	    }
	  }
	}

	// This will be set to a {lineWise: bool, text: [string]} object, so
	// that, when pasting, we know what kind of selections the copied
	// text was made out of.
	var lastCopied = null;

	function setLastCopied(newLastCopied) {
	  lastCopied = newLastCopied;
	}

	function applyTextInput(cm, inserted, deleted, sel, origin) {
	  var doc = cm.doc;
	  cm.display.shift = false;
	  if (!sel) { sel = doc.sel; }

	  var paste = cm.state.pasteIncoming || origin == "paste";
	  var textLines = splitLinesAuto(inserted), multiPaste = null;
	  // When pasing N lines into N selections, insert one line per selection
	  if (paste && sel.ranges.length > 1) {
	    if (lastCopied && lastCopied.text.join("\n") == inserted) {
	      if (sel.ranges.length % lastCopied.text.length == 0) {
	        multiPaste = [];
	        for (var i = 0; i < lastCopied.text.length; i++)
	          { multiPaste.push(doc.splitLines(lastCopied.text[i])); }
	      }
	    } else if (textLines.length == sel.ranges.length && cm.options.pasteLinesPerSelection) {
	      multiPaste = map(textLines, function (l) { return [l]; });
	    }
	  }

	  var updateInput;
	  // Normal behavior is to insert the new text into every selection
	  for (var i$1 = sel.ranges.length - 1; i$1 >= 0; i$1--) {
	    var range$$1 = sel.ranges[i$1];
	    var from = range$$1.from(), to = range$$1.to();
	    if (range$$1.empty()) {
	      if (deleted && deleted > 0) // Handle deletion
	        { from = Pos(from.line, from.ch - deleted); }
	      else if (cm.state.overwrite && !paste) // Handle overwrite
	        { to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length)); }
	      else if (lastCopied && lastCopied.lineWise && lastCopied.text.join("\n") == inserted)
	        { from = to = Pos(from.line, 0); }
	    }
	    updateInput = cm.curOp.updateInput;
	    var changeEvent = {from: from, to: to, text: multiPaste ? multiPaste[i$1 % multiPaste.length] : textLines,
	                       origin: origin || (paste ? "paste" : cm.state.cutIncoming ? "cut" : "+input")};
	    makeChange(cm.doc, changeEvent);
	    signalLater(cm, "inputRead", cm, changeEvent);
	  }
	  if (inserted && !paste)
	    { triggerElectric(cm, inserted); }

	  ensureCursorVisible(cm);
	  cm.curOp.updateInput = updateInput;
	  cm.curOp.typing = true;
	  cm.state.pasteIncoming = cm.state.cutIncoming = false;
	}

	function handlePaste(e, cm) {
	  var pasted = e.clipboardData && e.clipboardData.getData("Text");
	  if (pasted) {
	    e.preventDefault();
	    if (!cm.isReadOnly() && !cm.options.disableInput)
	      { runInOp(cm, function () { return applyTextInput(cm, pasted, 0, null, "paste"); }); }
	    return true
	  }
	}

	function triggerElectric(cm, inserted) {
	  // When an 'electric' character is inserted, immediately trigger a reindent
	  if (!cm.options.electricChars || !cm.options.smartIndent) { return }
	  var sel = cm.doc.sel;

	  for (var i = sel.ranges.length - 1; i >= 0; i--) {
	    var range$$1 = sel.ranges[i];
	    if (range$$1.head.ch > 100 || (i && sel.ranges[i - 1].head.line == range$$1.head.line)) { continue }
	    var mode = cm.getModeAt(range$$1.head);
	    var indented = false;
	    if (mode.electricChars) {
	      for (var j = 0; j < mode.electricChars.length; j++)
	        { if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
	          indented = indentLine(cm, range$$1.head.line, "smart");
	          break
	        } }
	    } else if (mode.electricInput) {
	      if (mode.electricInput.test(getLine(cm.doc, range$$1.head.line).text.slice(0, range$$1.head.ch)))
	        { indented = indentLine(cm, range$$1.head.line, "smart"); }
	    }
	    if (indented) { signalLater(cm, "electricInput", cm, range$$1.head.line); }
	  }
	}

	function copyableRanges(cm) {
	  var text = [], ranges = [];
	  for (var i = 0; i < cm.doc.sel.ranges.length; i++) {
	    var line = cm.doc.sel.ranges[i].head.line;
	    var lineRange = {anchor: Pos(line, 0), head: Pos(line + 1, 0)};
	    ranges.push(lineRange);
	    text.push(cm.getRange(lineRange.anchor, lineRange.head));
	  }
	  return {text: text, ranges: ranges}
	}

	function disableBrowserMagic(field, spellcheck) {
	  field.setAttribute("autocorrect", "off");
	  field.setAttribute("autocapitalize", "off");
	  field.setAttribute("spellcheck", !!spellcheck);
	}

	function hiddenTextarea() {
	  var te = elt("textarea", null, null, "position: absolute; bottom: -1em; padding: 0; width: 1px; height: 1em; outline: none");
	  var div = elt("div", [te], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
	  // The textarea is kept positioned near the cursor to prevent the
	  // fact that it'll be scrolled into view on input from scrolling
	  // our fake cursor out of view. On webkit, when wrap=off, paste is
	  // very slow. So make the area wide instead.
	  if (webkit) { te.style.width = "1000px"; }
	  else { te.setAttribute("wrap", "off"); }
	  // If border: 0; -- iOS fails to open keyboard (issue #1287)
	  if (ios) { te.style.border = "1px solid black"; }
	  disableBrowserMagic(te);
	  return div
	}

	// The publicly visible API. Note that methodOp(f) means
	// 'wrap f in an operation, performed on its `this` parameter'.

	// This is not the complete set of editor methods. Most of the
	// methods defined on the Doc type are also injected into
	// CodeMirror.prototype, for backwards compatibility and
	// convenience.

	var addEditorMethods = function(CodeMirror) {
	  var optionHandlers = CodeMirror.optionHandlers;

	  var helpers = CodeMirror.helpers = {};

	  CodeMirror.prototype = {
	    constructor: CodeMirror,
	    focus: function(){window.focus(); this.display.input.focus();},

	    setOption: function(option, value) {
	      var options = this.options, old = options[option];
	      if (options[option] == value && option != "mode") { return }
	      options[option] = value;
	      if (optionHandlers.hasOwnProperty(option))
	        { operation(this, optionHandlers[option])(this, value, old); }
	      signal(this, "optionChange", this, option);
	    },

	    getOption: function(option) {return this.options[option]},
	    getDoc: function() {return this.doc},

	    addKeyMap: function(map$$1, bottom) {
	      this.state.keyMaps[bottom ? "push" : "unshift"](getKeyMap(map$$1));
	    },
	    removeKeyMap: function(map$$1) {
	      var maps = this.state.keyMaps;
	      for (var i = 0; i < maps.length; ++i)
	        { if (maps[i] == map$$1 || maps[i].name == map$$1) {
	          maps.splice(i, 1);
	          return true
	        } }
	    },

	    addOverlay: methodOp(function(spec, options) {
	      var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);
	      if (mode.startState) { throw new Error("Overlays may not be stateful.") }
	      insertSorted(this.state.overlays,
	                   {mode: mode, modeSpec: spec, opaque: options && options.opaque,
	                    priority: (options && options.priority) || 0},
	                   function (overlay) { return overlay.priority; });
	      this.state.modeGen++;
	      regChange(this);
	    }),
	    removeOverlay: methodOp(function(spec) {
	      var this$1 = this;

	      var overlays = this.state.overlays;
	      for (var i = 0; i < overlays.length; ++i) {
	        var cur = overlays[i].modeSpec;
	        if (cur == spec || typeof spec == "string" && cur.name == spec) {
	          overlays.splice(i, 1);
	          this$1.state.modeGen++;
	          regChange(this$1);
	          return
	        }
	      }
	    }),

	    indentLine: methodOp(function(n, dir, aggressive) {
	      if (typeof dir != "string" && typeof dir != "number") {
	        if (dir == null) { dir = this.options.smartIndent ? "smart" : "prev"; }
	        else { dir = dir ? "add" : "subtract"; }
	      }
	      if (isLine(this.doc, n)) { indentLine(this, n, dir, aggressive); }
	    }),
	    indentSelection: methodOp(function(how) {
	      var this$1 = this;

	      var ranges = this.doc.sel.ranges, end = -1;
	      for (var i = 0; i < ranges.length; i++) {
	        var range$$1 = ranges[i];
	        if (!range$$1.empty()) {
	          var from = range$$1.from(), to = range$$1.to();
	          var start = Math.max(end, from.line);
	          end = Math.min(this$1.lastLine(), to.line - (to.ch ? 0 : 1)) + 1;
	          for (var j = start; j < end; ++j)
	            { indentLine(this$1, j, how); }
	          var newRanges = this$1.doc.sel.ranges;
	          if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0)
	            { replaceOneSelection(this$1.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll); }
	        } else if (range$$1.head.line > end) {
	          indentLine(this$1, range$$1.head.line, how, true);
	          end = range$$1.head.line;
	          if (i == this$1.doc.sel.primIndex) { ensureCursorVisible(this$1); }
	        }
	      }
	    }),

	    // Fetch the parser token for a given character. Useful for hacks
	    // that want to inspect the mode state (say, for completion).
	    getTokenAt: function(pos, precise) {
	      return takeToken(this, pos, precise)
	    },

	    getLineTokens: function(line, precise) {
	      return takeToken(this, Pos(line), precise, true)
	    },

	    getTokenTypeAt: function(pos) {
	      pos = clipPos(this.doc, pos);
	      var styles = getLineStyles(this, getLine(this.doc, pos.line));
	      var before = 0, after = (styles.length - 1) / 2, ch = pos.ch;
	      var type;
	      if (ch == 0) { type = styles[2]; }
	      else { for (;;) {
	        var mid = (before + after) >> 1;
	        if ((mid ? styles[mid * 2 - 1] : 0) >= ch) { after = mid; }
	        else if (styles[mid * 2 + 1] < ch) { before = mid + 1; }
	        else { type = styles[mid * 2 + 2]; break }
	      } }
	      var cut = type ? type.indexOf("overlay ") : -1;
	      return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1)
	    },

	    getModeAt: function(pos) {
	      var mode = this.doc.mode;
	      if (!mode.innerMode) { return mode }
	      return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode
	    },

	    getHelper: function(pos, type) {
	      return this.getHelpers(pos, type)[0]
	    },

	    getHelpers: function(pos, type) {
	      var this$1 = this;

	      var found = [];
	      if (!helpers.hasOwnProperty(type)) { return found }
	      var help = helpers[type], mode = this.getModeAt(pos);
	      if (typeof mode[type] == "string") {
	        if (help[mode[type]]) { found.push(help[mode[type]]); }
	      } else if (mode[type]) {
	        for (var i = 0; i < mode[type].length; i++) {
	          var val = help[mode[type][i]];
	          if (val) { found.push(val); }
	        }
	      } else if (mode.helperType && help[mode.helperType]) {
	        found.push(help[mode.helperType]);
	      } else if (help[mode.name]) {
	        found.push(help[mode.name]);
	      }
	      for (var i$1 = 0; i$1 < help._global.length; i$1++) {
	        var cur = help._global[i$1];
	        if (cur.pred(mode, this$1) && indexOf(found, cur.val) == -1)
	          { found.push(cur.val); }
	      }
	      return found
	    },

	    getStateAfter: function(line, precise) {
	      var doc = this.doc;
	      line = clipLine(doc, line == null ? doc.first + doc.size - 1: line);
	      return getContextBefore(this, line + 1, precise).state
	    },

	    cursorCoords: function(start, mode) {
	      var pos, range$$1 = this.doc.sel.primary();
	      if (start == null) { pos = range$$1.head; }
	      else if (typeof start == "object") { pos = clipPos(this.doc, start); }
	      else { pos = start ? range$$1.from() : range$$1.to(); }
	      return cursorCoords(this, pos, mode || "page")
	    },

	    charCoords: function(pos, mode) {
	      return charCoords(this, clipPos(this.doc, pos), mode || "page")
	    },

	    coordsChar: function(coords, mode) {
	      coords = fromCoordSystem(this, coords, mode || "page");
	      return coordsChar(this, coords.left, coords.top)
	    },

	    lineAtHeight: function(height, mode) {
	      height = fromCoordSystem(this, {top: height, left: 0}, mode || "page").top;
	      return lineAtHeight(this.doc, height + this.display.viewOffset)
	    },
	    heightAtLine: function(line, mode, includeWidgets) {
	      var end = false, lineObj;
	      if (typeof line == "number") {
	        var last = this.doc.first + this.doc.size - 1;
	        if (line < this.doc.first) { line = this.doc.first; }
	        else if (line > last) { line = last; end = true; }
	        lineObj = getLine(this.doc, line);
	      } else {
	        lineObj = line;
	      }
	      return intoCoordSystem(this, lineObj, {top: 0, left: 0}, mode || "page", includeWidgets || end).top +
	        (end ? this.doc.height - heightAtLine(lineObj) : 0)
	    },

	    defaultTextHeight: function() { return textHeight(this.display) },
	    defaultCharWidth: function() { return charWidth(this.display) },

	    getViewport: function() { return {from: this.display.viewFrom, to: this.display.viewTo}},

	    addWidget: function(pos, node, scroll, vert, horiz) {
	      var display = this.display;
	      pos = cursorCoords(this, clipPos(this.doc, pos));
	      var top = pos.bottom, left = pos.left;
	      node.style.position = "absolute";
	      node.setAttribute("cm-ignore-events", "true");
	      this.display.input.setUneditable(node);
	      display.sizer.appendChild(node);
	      if (vert == "over") {
	        top = pos.top;
	      } else if (vert == "above" || vert == "near") {
	        var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
	        hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);
	        // Default to positioning above (if specified and possible); otherwise default to positioning below
	        if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight)
	          { top = pos.top - node.offsetHeight; }
	        else if (pos.bottom + node.offsetHeight <= vspace)
	          { top = pos.bottom; }
	        if (left + node.offsetWidth > hspace)
	          { left = hspace - node.offsetWidth; }
	      }
	      node.style.top = top + "px";
	      node.style.left = node.style.right = "";
	      if (horiz == "right") {
	        left = display.sizer.clientWidth - node.offsetWidth;
	        node.style.right = "0px";
	      } else {
	        if (horiz == "left") { left = 0; }
	        else if (horiz == "middle") { left = (display.sizer.clientWidth - node.offsetWidth) / 2; }
	        node.style.left = left + "px";
	      }
	      if (scroll)
	        { scrollIntoView(this, {left: left, top: top, right: left + node.offsetWidth, bottom: top + node.offsetHeight}); }
	    },

	    triggerOnKeyDown: methodOp(onKeyDown),
	    triggerOnKeyPress: methodOp(onKeyPress),
	    triggerOnKeyUp: onKeyUp,
	    triggerOnMouseDown: methodOp(onMouseDown),

	    execCommand: function(cmd) {
	      if (commands.hasOwnProperty(cmd))
	        { return commands[cmd].call(null, this) }
	    },

	    triggerElectric: methodOp(function(text) { triggerElectric(this, text); }),

	    findPosH: function(from, amount, unit, visually) {
	      var this$1 = this;

	      var dir = 1;
	      if (amount < 0) { dir = -1; amount = -amount; }
	      var cur = clipPos(this.doc, from);
	      for (var i = 0; i < amount; ++i) {
	        cur = findPosH(this$1.doc, cur, dir, unit, visually);
	        if (cur.hitSide) { break }
	      }
	      return cur
	    },

	    moveH: methodOp(function(dir, unit) {
	      var this$1 = this;

	      this.extendSelectionsBy(function (range$$1) {
	        if (this$1.display.shift || this$1.doc.extend || range$$1.empty())
	          { return findPosH(this$1.doc, range$$1.head, dir, unit, this$1.options.rtlMoveVisually) }
	        else
	          { return dir < 0 ? range$$1.from() : range$$1.to() }
	      }, sel_move);
	    }),

	    deleteH: methodOp(function(dir, unit) {
	      var sel = this.doc.sel, doc = this.doc;
	      if (sel.somethingSelected())
	        { doc.replaceSelection("", null, "+delete"); }
	      else
	        { deleteNearSelection(this, function (range$$1) {
	          var other = findPosH(doc, range$$1.head, dir, unit, false);
	          return dir < 0 ? {from: other, to: range$$1.head} : {from: range$$1.head, to: other}
	        }); }
	    }),

	    findPosV: function(from, amount, unit, goalColumn) {
	      var this$1 = this;

	      var dir = 1, x = goalColumn;
	      if (amount < 0) { dir = -1; amount = -amount; }
	      var cur = clipPos(this.doc, from);
	      for (var i = 0; i < amount; ++i) {
	        var coords = cursorCoords(this$1, cur, "div");
	        if (x == null) { x = coords.left; }
	        else { coords.left = x; }
	        cur = findPosV(this$1, coords, dir, unit);
	        if (cur.hitSide) { break }
	      }
	      return cur
	    },

	    moveV: methodOp(function(dir, unit) {
	      var this$1 = this;

	      var doc = this.doc, goals = [];
	      var collapse = !this.display.shift && !doc.extend && doc.sel.somethingSelected();
	      doc.extendSelectionsBy(function (range$$1) {
	        if (collapse)
	          { return dir < 0 ? range$$1.from() : range$$1.to() }
	        var headPos = cursorCoords(this$1, range$$1.head, "div");
	        if (range$$1.goalColumn != null) { headPos.left = range$$1.goalColumn; }
	        goals.push(headPos.left);
	        var pos = findPosV(this$1, headPos, dir, unit);
	        if (unit == "page" && range$$1 == doc.sel.primary())
	          { addToScrollTop(this$1, charCoords(this$1, pos, "div").top - headPos.top); }
	        return pos
	      }, sel_move);
	      if (goals.length) { for (var i = 0; i < doc.sel.ranges.length; i++)
	        { doc.sel.ranges[i].goalColumn = goals[i]; } }
	    }),

	    // Find the word at the given position (as returned by coordsChar).
	    findWordAt: function(pos) {
	      var doc = this.doc, line = getLine(doc, pos.line).text;
	      var start = pos.ch, end = pos.ch;
	      if (line) {
	        var helper = this.getHelper(pos, "wordChars");
	        if ((pos.sticky == "before" || end == line.length) && start) { --start; } else { ++end; }
	        var startChar = line.charAt(start);
	        var check = isWordChar(startChar, helper)
	          ? function (ch) { return isWordChar(ch, helper); }
	          : /\s/.test(startChar) ? function (ch) { return /\s/.test(ch); }
	          : function (ch) { return (!/\s/.test(ch) && !isWordChar(ch)); };
	        while (start > 0 && check(line.charAt(start - 1))) { --start; }
	        while (end < line.length && check(line.charAt(end))) { ++end; }
	      }
	      return new Range(Pos(pos.line, start), Pos(pos.line, end))
	    },

	    toggleOverwrite: function(value) {
	      if (value != null && value == this.state.overwrite) { return }
	      if (this.state.overwrite = !this.state.overwrite)
	        { addClass(this.display.cursorDiv, "CodeMirror-overwrite"); }
	      else
	        { rmClass(this.display.cursorDiv, "CodeMirror-overwrite"); }

	      signal(this, "overwriteToggle", this, this.state.overwrite);
	    },
	    hasFocus: function() { return this.display.input.getField() == activeElt() },
	    isReadOnly: function() { return !!(this.options.readOnly || this.doc.cantEdit) },

	    scrollTo: methodOp(function (x, y) { scrollToCoords(this, x, y); }),
	    getScrollInfo: function() {
	      var scroller = this.display.scroller;
	      return {left: scroller.scrollLeft, top: scroller.scrollTop,
	              height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,
	              width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,
	              clientHeight: displayHeight(this), clientWidth: displayWidth(this)}
	    },

	    scrollIntoView: methodOp(function(range$$1, margin) {
	      if (range$$1 == null) {
	        range$$1 = {from: this.doc.sel.primary().head, to: null};
	        if (margin == null) { margin = this.options.cursorScrollMargin; }
	      } else if (typeof range$$1 == "number") {
	        range$$1 = {from: Pos(range$$1, 0), to: null};
	      } else if (range$$1.from == null) {
	        range$$1 = {from: range$$1, to: null};
	      }
	      if (!range$$1.to) { range$$1.to = range$$1.from; }
	      range$$1.margin = margin || 0;

	      if (range$$1.from.line != null) {
	        scrollToRange(this, range$$1);
	      } else {
	        scrollToCoordsRange(this, range$$1.from, range$$1.to, range$$1.margin);
	      }
	    }),

	    setSize: methodOp(function(width, height) {
	      var this$1 = this;

	      var interpret = function (val) { return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val; };
	      if (width != null) { this.display.wrapper.style.width = interpret(width); }
	      if (height != null) { this.display.wrapper.style.height = interpret(height); }
	      if (this.options.lineWrapping) { clearLineMeasurementCache(this); }
	      var lineNo$$1 = this.display.viewFrom;
	      this.doc.iter(lineNo$$1, this.display.viewTo, function (line) {
	        if (line.widgets) { for (var i = 0; i < line.widgets.length; i++)
	          { if (line.widgets[i].noHScroll) { regLineChange(this$1, lineNo$$1, "widget"); break } } }
	        ++lineNo$$1;
	      });
	      this.curOp.forceUpdate = true;
	      signal(this, "refresh", this);
	    }),

	    operation: function(f){return runInOp(this, f)},
	    startOperation: function(){return startOperation(this)},
	    endOperation: function(){return endOperation(this)},

	    refresh: methodOp(function() {
	      var oldHeight = this.display.cachedTextHeight;
	      regChange(this);
	      this.curOp.forceUpdate = true;
	      clearCaches(this);
	      scrollToCoords(this, this.doc.scrollLeft, this.doc.scrollTop);
	      updateGutterSpace(this);
	      if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5)
	        { estimateLineHeights(this); }
	      signal(this, "refresh", this);
	    }),

	    swapDoc: methodOp(function(doc) {
	      var old = this.doc;
	      old.cm = null;
	      attachDoc(this, doc);
	      clearCaches(this);
	      this.display.input.reset();
	      scrollToCoords(this, doc.scrollLeft, doc.scrollTop);
	      this.curOp.forceScroll = true;
	      signalLater(this, "swapDoc", this, old);
	      return old
	    }),

	    getInputField: function(){return this.display.input.getField()},
	    getWrapperElement: function(){return this.display.wrapper},
	    getScrollerElement: function(){return this.display.scroller},
	    getGutterElement: function(){return this.display.gutters}
	  };
	  eventMixin(CodeMirror);

	  CodeMirror.registerHelper = function(type, name, value) {
	    if (!helpers.hasOwnProperty(type)) { helpers[type] = CodeMirror[type] = {_global: []}; }
	    helpers[type][name] = value;
	  };
	  CodeMirror.registerGlobalHelper = function(type, name, predicate, value) {
	    CodeMirror.registerHelper(type, name, value);
	    helpers[type]._global.push({pred: predicate, val: value});
	  };
	};

	// Used for horizontal relative motion. Dir is -1 or 1 (left or
	// right), unit can be "char", "column" (like char, but doesn't
	// cross line boundaries), "word" (across next word), or "group" (to
	// the start of next group of word or non-word-non-whitespace
	// chars). The visually param controls whether, in right-to-left
	// text, direction 1 means to move towards the next index in the
	// string, or towards the character to the right of the current
	// position. The resulting position will have a hitSide=true
	// property if it reached the end of the document.
	function findPosH(doc, pos, dir, unit, visually) {
	  var oldPos = pos;
	  var origDir = dir;
	  var lineObj = getLine(doc, pos.line);
	  function findNextLine() {
	    var l = pos.line + dir;
	    if (l < doc.first || l >= doc.first + doc.size) { return false }
	    pos = new Pos(l, pos.ch, pos.sticky);
	    return lineObj = getLine(doc, l)
	  }
	  function moveOnce(boundToLine) {
	    var next;
	    if (visually) {
	      next = moveVisually(doc.cm, lineObj, pos, dir);
	    } else {
	      next = moveLogically(lineObj, pos, dir);
	    }
	    if (next == null) {
	      if (!boundToLine && findNextLine())
	        { pos = endOfLine(visually, doc.cm, lineObj, pos.line, dir); }
	      else
	        { return false }
	    } else {
	      pos = next;
	    }
	    return true
	  }

	  if (unit == "char") {
	    moveOnce();
	  } else if (unit == "column") {
	    moveOnce(true);
	  } else if (unit == "word" || unit == "group") {
	    var sawType = null, group = unit == "group";
	    var helper = doc.cm && doc.cm.getHelper(pos, "wordChars");
	    for (var first = true;; first = false) {
	      if (dir < 0 && !moveOnce(!first)) { break }
	      var cur = lineObj.text.charAt(pos.ch) || "\n";
	      var type = isWordChar(cur, helper) ? "w"
	        : group && cur == "\n" ? "n"
	        : !group || /\s/.test(cur) ? null
	        : "p";
	      if (group && !first && !type) { type = "s"; }
	      if (sawType && sawType != type) {
	        if (dir < 0) {dir = 1; moveOnce(); pos.sticky = "after";}
	        break
	      }

	      if (type) { sawType = type; }
	      if (dir > 0 && !moveOnce(!first)) { break }
	    }
	  }
	  var result = skipAtomic(doc, pos, oldPos, origDir, true);
	  if (equalCursorPos(oldPos, result)) { result.hitSide = true; }
	  return result
	}

	// For relative vertical movement. Dir may be -1 or 1. Unit can be
	// "page" or "line". The resulting position will have a hitSide=true
	// property if it reached the end of the document.
	function findPosV(cm, pos, dir, unit) {
	  var doc = cm.doc, x = pos.left, y;
	  if (unit == "page") {
	    var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);
	    var moveAmount = Math.max(pageSize - .5 * textHeight(cm.display), 3);
	    y = (dir > 0 ? pos.bottom : pos.top) + dir * moveAmount;

	  } else if (unit == "line") {
	    y = dir > 0 ? pos.bottom + 3 : pos.top - 3;
	  }
	  var target;
	  for (;;) {
	    target = coordsChar(cm, x, y);
	    if (!target.outside) { break }
	    if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break }
	    y += dir * 5;
	  }
	  return target
	}

	// CONTENTEDITABLE INPUT STYLE

	var ContentEditableInput = function(cm) {
	  this.cm = cm;
	  this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null;
	  this.polling = new Delayed();
	  this.composing = null;
	  this.gracePeriod = false;
	  this.readDOMTimeout = null;
	};

	ContentEditableInput.prototype.init = function (display) {
	    var this$1 = this;

	  var input = this, cm = input.cm;
	  var div = input.div = display.lineDiv;
	  disableBrowserMagic(div, cm.options.spellcheck);

	  on(div, "paste", function (e) {
	    if (signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }
	    // IE doesn't fire input events, so we schedule a read for the pasted content in this way
	    if (ie_version <= 11) { setTimeout(operation(cm, function () { return this$1.updateFromDOM(); }), 20); }
	  });

	  on(div, "compositionstart", function (e) {
	    this$1.composing = {data: e.data, done: false};
	  });
	  on(div, "compositionupdate", function (e) {
	    if (!this$1.composing) { this$1.composing = {data: e.data, done: false}; }
	  });
	  on(div, "compositionend", function (e) {
	    if (this$1.composing) {
	      if (e.data != this$1.composing.data) { this$1.readFromDOMSoon(); }
	      this$1.composing.done = true;
	    }
	  });

	  on(div, "touchstart", function () { return input.forceCompositionEnd(); });

	  on(div, "input", function () {
	    if (!this$1.composing) { this$1.readFromDOMSoon(); }
	  });

	  function onCopyCut(e) {
	    if (signalDOMEvent(cm, e)) { return }
	    if (cm.somethingSelected()) {
	      setLastCopied({lineWise: false, text: cm.getSelections()});
	      if (e.type == "cut") { cm.replaceSelection("", null, "cut"); }
	    } else if (!cm.options.lineWiseCopyCut) {
	      return
	    } else {
	      var ranges = copyableRanges(cm);
	      setLastCopied({lineWise: true, text: ranges.text});
	      if (e.type == "cut") {
	        cm.operation(function () {
	          cm.setSelections(ranges.ranges, 0, sel_dontScroll);
	          cm.replaceSelection("", null, "cut");
	        });
	      }
	    }
	    if (e.clipboardData) {
	      e.clipboardData.clearData();
	      var content = lastCopied.text.join("\n");
	      // iOS exposes the clipboard API, but seems to discard content inserted into it
	      e.clipboardData.setData("Text", content);
	      if (e.clipboardData.getData("Text") == content) {
	        e.preventDefault();
	        return
	      }
	    }
	    // Old-fashioned briefly-focus-a-textarea hack
	    var kludge = hiddenTextarea(), te = kludge.firstChild;
	    cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild);
	    te.value = lastCopied.text.join("\n");
	    var hadFocus = document.activeElement;
	    selectInput(te);
	    setTimeout(function () {
	      cm.display.lineSpace.removeChild(kludge);
	      hadFocus.focus();
	      if (hadFocus == div) { input.showPrimarySelection(); }
	    }, 50);
	  }
	  on(div, "copy", onCopyCut);
	  on(div, "cut", onCopyCut);
	};

	ContentEditableInput.prototype.prepareSelection = function () {
	  var result = prepareSelection(this.cm, false);
	  result.focus = this.cm.state.focused;
	  return result
	};

	ContentEditableInput.prototype.showSelection = function (info, takeFocus) {
	  if (!info || !this.cm.display.view.length) { return }
	  if (info.focus || takeFocus) { this.showPrimarySelection(); }
	  this.showMultipleSelections(info);
	};

	ContentEditableInput.prototype.showPrimarySelection = function () {
	  var sel = window.getSelection(), cm = this.cm, prim = cm.doc.sel.primary();
	  var from = prim.from(), to = prim.to();

	  if (cm.display.viewTo == cm.display.viewFrom || from.line >= cm.display.viewTo || to.line < cm.display.viewFrom) {
	    sel.removeAllRanges();
	    return
	  }

	  var curAnchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
	  var curFocus = domToPos(cm, sel.focusNode, sel.focusOffset);
	  if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&
	      cmp(minPos(curAnchor, curFocus), from) == 0 &&
	      cmp(maxPos(curAnchor, curFocus), to) == 0)
	    { return }

	  var view = cm.display.view;
	  var start = (from.line >= cm.display.viewFrom && posToDOM(cm, from)) ||
	      {node: view[0].measure.map[2], offset: 0};
	  var end = to.line < cm.display.viewTo && posToDOM(cm, to);
	  if (!end) {
	    var measure = view[view.length - 1].measure;
	    var map$$1 = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map;
	    end = {node: map$$1[map$$1.length - 1], offset: map$$1[map$$1.length - 2] - map$$1[map$$1.length - 3]};
	  }

	  if (!start || !end) {
	    sel.removeAllRanges();
	    return
	  }

	  var old = sel.rangeCount && sel.getRangeAt(0), rng;
	  try { rng = range(start.node, start.offset, end.offset, end.node); }
	  catch(e) {} // Our model of the DOM might be outdated, in which case the range we try to set can be impossible
	  if (rng) {
	    if (!gecko && cm.state.focused) {
	      sel.collapse(start.node, start.offset);
	      if (!rng.collapsed) {
	        sel.removeAllRanges();
	        sel.addRange(rng);
	      }
	    } else {
	      sel.removeAllRanges();
	      sel.addRange(rng);
	    }
	    if (old && sel.anchorNode == null) { sel.addRange(old); }
	    else if (gecko) { this.startGracePeriod(); }
	  }
	  this.rememberSelection();
	};

	ContentEditableInput.prototype.startGracePeriod = function () {
	    var this$1 = this;

	  clearTimeout(this.gracePeriod);
	  this.gracePeriod = setTimeout(function () {
	    this$1.gracePeriod = false;
	    if (this$1.selectionChanged())
	      { this$1.cm.operation(function () { return this$1.cm.curOp.selectionChanged = true; }); }
	  }, 20);
	};

	ContentEditableInput.prototype.showMultipleSelections = function (info) {
	  removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors);
	  removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection);
	};

	ContentEditableInput.prototype.rememberSelection = function () {
	  var sel = window.getSelection();
	  this.lastAnchorNode = sel.anchorNode; this.lastAnchorOffset = sel.anchorOffset;
	  this.lastFocusNode = sel.focusNode; this.lastFocusOffset = sel.focusOffset;
	};

	ContentEditableInput.prototype.selectionInEditor = function () {
	  var sel = window.getSelection();
	  if (!sel.rangeCount) { return false }
	  var node = sel.getRangeAt(0).commonAncestorContainer;
	  return contains(this.div, node)
	};

	ContentEditableInput.prototype.focus = function () {
	  if (this.cm.options.readOnly != "nocursor") {
	    if (!this.selectionInEditor())
	      { this.showSelection(this.prepareSelection(), true); }
	    this.div.focus();
	  }
	};
	ContentEditableInput.prototype.blur = function () { this.div.blur(); };
	ContentEditableInput.prototype.getField = function () { return this.div };

	ContentEditableInput.prototype.supportsTouch = function () { return true };

	ContentEditableInput.prototype.receivedFocus = function () {
	  var input = this;
	  if (this.selectionInEditor())
	    { this.pollSelection(); }
	  else
	    { runInOp(this.cm, function () { return input.cm.curOp.selectionChanged = true; }); }

	  function poll() {
	    if (input.cm.state.focused) {
	      input.pollSelection();
	      input.polling.set(input.cm.options.pollInterval, poll);
	    }
	  }
	  this.polling.set(this.cm.options.pollInterval, poll);
	};

	ContentEditableInput.prototype.selectionChanged = function () {
	  var sel = window.getSelection();
	  return sel.anchorNode != this.lastAnchorNode || sel.anchorOffset != this.lastAnchorOffset ||
	    sel.focusNode != this.lastFocusNode || sel.focusOffset != this.lastFocusOffset
	};

	ContentEditableInput.prototype.pollSelection = function () {
	  if (this.readDOMTimeout != null || this.gracePeriod || !this.selectionChanged()) { return }
	  var sel = window.getSelection(), cm = this.cm;
	  // On Android Chrome (version 56, at least), backspacing into an
	  // uneditable block element will put the cursor in that element,
	  // and then, because it's not editable, hide the virtual keyboard.
	  // Because Android doesn't allow us to actually detect backspace
	  // presses in a sane way, this code checks for when that happens
	  // and simulates a backspace press in this case.
	  if (android && chrome && this.cm.options.gutters.length && isInGutter(sel.anchorNode)) {
	    this.cm.triggerOnKeyDown({type: "keydown", keyCode: 8, preventDefault: Math.abs});
	    this.blur();
	    this.focus();
	    return
	  }
	  if (this.composing) { return }
	  this.rememberSelection();
	  var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
	  var head = domToPos(cm, sel.focusNode, sel.focusOffset);
	  if (anchor && head) { runInOp(cm, function () {
	    setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll);
	    if (anchor.bad || head.bad) { cm.curOp.selectionChanged = true; }
	  }); }
	};

	ContentEditableInput.prototype.pollContent = function () {
	  if (this.readDOMTimeout != null) {
	    clearTimeout(this.readDOMTimeout);
	    this.readDOMTimeout = null;
	  }

	  var cm = this.cm, display = cm.display, sel = cm.doc.sel.primary();
	  var from = sel.from(), to = sel.to();
	  if (from.ch == 0 && from.line > cm.firstLine())
	    { from = Pos(from.line - 1, getLine(cm.doc, from.line - 1).length); }
	  if (to.ch == getLine(cm.doc, to.line).text.length && to.line < cm.lastLine())
	    { to = Pos(to.line + 1, 0); }
	  if (from.line < display.viewFrom || to.line > display.viewTo - 1) { return false }

	  var fromIndex, fromLine, fromNode;
	  if (from.line == display.viewFrom || (fromIndex = findViewIndex(cm, from.line)) == 0) {
	    fromLine = lineNo(display.view[0].line);
	    fromNode = display.view[0].node;
	  } else {
	    fromLine = lineNo(display.view[fromIndex].line);
	    fromNode = display.view[fromIndex - 1].node.nextSibling;
	  }
	  var toIndex = findViewIndex(cm, to.line);
	  var toLine, toNode;
	  if (toIndex == display.view.length - 1) {
	    toLine = display.viewTo - 1;
	    toNode = display.lineDiv.lastChild;
	  } else {
	    toLine = lineNo(display.view[toIndex + 1].line) - 1;
	    toNode = display.view[toIndex + 1].node.previousSibling;
	  }

	  if (!fromNode) { return false }
	  var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine));
	  var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length));
	  while (newText.length > 1 && oldText.length > 1) {
	    if (lst(newText) == lst(oldText)) { newText.pop(); oldText.pop(); toLine--; }
	    else if (newText[0] == oldText[0]) { newText.shift(); oldText.shift(); fromLine++; }
	    else { break }
	  }

	  var cutFront = 0, cutEnd = 0;
	  var newTop = newText[0], oldTop = oldText[0], maxCutFront = Math.min(newTop.length, oldTop.length);
	  while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront))
	    { ++cutFront; }
	  var newBot = lst(newText), oldBot = lst(oldText);
	  var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),
	                           oldBot.length - (oldText.length == 1 ? cutFront : 0));
	  while (cutEnd < maxCutEnd &&
	         newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1))
	    { ++cutEnd; }
	  // Try to move start of change to start of selection if ambiguous
	  if (newText.length == 1 && oldText.length == 1 && fromLine == from.line) {
	    while (cutFront && cutFront > from.ch &&
	           newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) {
	      cutFront--;
	      cutEnd++;
	    }
	  }

	  newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd).replace(/^\u200b+/, "");
	  newText[0] = newText[0].slice(cutFront).replace(/\u200b+$/, "");

	  var chFrom = Pos(fromLine, cutFront);
	  var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0);
	  if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {
	    replaceRange(cm.doc, newText, chFrom, chTo, "+input");
	    return true
	  }
	};

	ContentEditableInput.prototype.ensurePolled = function () {
	  this.forceCompositionEnd();
	};
	ContentEditableInput.prototype.reset = function () {
	  this.forceCompositionEnd();
	};
	ContentEditableInput.prototype.forceCompositionEnd = function () {
	  if (!this.composing) { return }
	  clearTimeout(this.readDOMTimeout);
	  this.composing = null;
	  this.updateFromDOM();
	  this.div.blur();
	  this.div.focus();
	};
	ContentEditableInput.prototype.readFromDOMSoon = function () {
	    var this$1 = this;

	  if (this.readDOMTimeout != null) { return }
	  this.readDOMTimeout = setTimeout(function () {
	    this$1.readDOMTimeout = null;
	    if (this$1.composing) {
	      if (this$1.composing.done) { this$1.composing = null; }
	      else { return }
	    }
	    this$1.updateFromDOM();
	  }, 80);
	};

	ContentEditableInput.prototype.updateFromDOM = function () {
	    var this$1 = this;

	  if (this.cm.isReadOnly() || !this.pollContent())
	    { runInOp(this.cm, function () { return regChange(this$1.cm); }); }
	};

	ContentEditableInput.prototype.setUneditable = function (node) {
	  node.contentEditable = "false";
	};

	ContentEditableInput.prototype.onKeyPress = function (e) {
	  if (e.charCode == 0) { return }
	  e.preventDefault();
	  if (!this.cm.isReadOnly())
	    { operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0); }
	};

	ContentEditableInput.prototype.readOnlyChanged = function (val) {
	  this.div.contentEditable = String(val != "nocursor");
	};

	ContentEditableInput.prototype.onContextMenu = function () {};
	ContentEditableInput.prototype.resetPosition = function () {};

	ContentEditableInput.prototype.needsContentAttribute = true;

	function posToDOM(cm, pos) {
	  var view = findViewForLine(cm, pos.line);
	  if (!view || view.hidden) { return null }
	  var line = getLine(cm.doc, pos.line);
	  var info = mapFromLineView(view, line, pos.line);

	  var order = getOrder(line, cm.doc.direction), side = "left";
	  if (order) {
	    var partPos = getBidiPartAt(order, pos.ch);
	    side = partPos % 2 ? "right" : "left";
	  }
	  var result = nodeAndOffsetInLineMap(info.map, pos.ch, side);
	  result.offset = result.collapse == "right" ? result.end : result.start;
	  return result
	}

	function isInGutter(node) {
	  for (var scan = node; scan; scan = scan.parentNode)
	    { if (/CodeMirror-gutter-wrapper/.test(scan.className)) { return true } }
	  return false
	}

	function badPos(pos, bad) { if (bad) { pos.bad = true; } return pos }

	function domTextBetween(cm, from, to, fromLine, toLine) {
	  var text = "", closing = false, lineSep = cm.doc.lineSeparator();
	  function recognizeMarker(id) { return function (marker) { return marker.id == id; } }
	  function close() {
	    if (closing) {
	      text += lineSep;
	      closing = false;
	    }
	  }
	  function addText(str) {
	    if (str) {
	      close();
	      text += str;
	    }
	  }
	  function walk(node) {
	    if (node.nodeType == 1) {
	      var cmText = node.getAttribute("cm-text");
	      if (cmText != null) {
	        addText(cmText || node.textContent.replace(/\u200b/g, ""));
	        return
	      }
	      var markerID = node.getAttribute("cm-marker"), range$$1;
	      if (markerID) {
	        var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID));
	        if (found.length && (range$$1 = found[0].find()))
	          { addText(getBetween(cm.doc, range$$1.from, range$$1.to).join(lineSep)); }
	        return
	      }
	      if (node.getAttribute("contenteditable") == "false") { return }
	      var isBlock = /^(pre|div|p)$/i.test(node.nodeName);
	      if (isBlock) { close(); }
	      for (var i = 0; i < node.childNodes.length; i++)
	        { walk(node.childNodes[i]); }
	      if (isBlock) { closing = true; }
	    } else if (node.nodeType == 3) {
	      addText(node.nodeValue);
	    }
	  }
	  for (;;) {
	    walk(from);
	    if (from == to) { break }
	    from = from.nextSibling;
	  }
	  return text
	}

	function domToPos(cm, node, offset) {
	  var lineNode;
	  if (node == cm.display.lineDiv) {
	    lineNode = cm.display.lineDiv.childNodes[offset];
	    if (!lineNode) { return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true) }
	    node = null; offset = 0;
	  } else {
	    for (lineNode = node;; lineNode = lineNode.parentNode) {
	      if (!lineNode || lineNode == cm.display.lineDiv) { return null }
	      if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) { break }
	    }
	  }
	  for (var i = 0; i < cm.display.view.length; i++) {
	    var lineView = cm.display.view[i];
	    if (lineView.node == lineNode)
	      { return locateNodeInLineView(lineView, node, offset) }
	  }
	}

	function locateNodeInLineView(lineView, node, offset) {
	  var wrapper = lineView.text.firstChild, bad = false;
	  if (!node || !contains(wrapper, node)) { return badPos(Pos(lineNo(lineView.line), 0), true) }
	  if (node == wrapper) {
	    bad = true;
	    node = wrapper.childNodes[offset];
	    offset = 0;
	    if (!node) {
	      var line = lineView.rest ? lst(lineView.rest) : lineView.line;
	      return badPos(Pos(lineNo(line), line.text.length), bad)
	    }
	  }

	  var textNode = node.nodeType == 3 ? node : null, topNode = node;
	  if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {
	    textNode = node.firstChild;
	    if (offset) { offset = textNode.nodeValue.length; }
	  }
	  while (topNode.parentNode != wrapper) { topNode = topNode.parentNode; }
	  var measure = lineView.measure, maps = measure.maps;

	  function find(textNode, topNode, offset) {
	    for (var i = -1; i < (maps ? maps.length : 0); i++) {
	      var map$$1 = i < 0 ? measure.map : maps[i];
	      for (var j = 0; j < map$$1.length; j += 3) {
	        var curNode = map$$1[j + 2];
	        if (curNode == textNode || curNode == topNode) {
	          var line = lineNo(i < 0 ? lineView.line : lineView.rest[i]);
	          var ch = map$$1[j] + offset;
	          if (offset < 0 || curNode != textNode) { ch = map$$1[j + (offset ? 1 : 0)]; }
	          return Pos(line, ch)
	        }
	      }
	    }
	  }
	  var found = find(textNode, topNode, offset);
	  if (found) { return badPos(found, bad) }

	  // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems
	  for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {
	    found = find(after, after.firstChild, 0);
	    if (found)
	      { return badPos(Pos(found.line, found.ch - dist), bad) }
	    else
	      { dist += after.textContent.length; }
	  }
	  for (var before = topNode.previousSibling, dist$1 = offset; before; before = before.previousSibling) {
	    found = find(before, before.firstChild, -1);
	    if (found)
	      { return badPos(Pos(found.line, found.ch + dist$1), bad) }
	    else
	      { dist$1 += before.textContent.length; }
	  }
	}

	// TEXTAREA INPUT STYLE

	var TextareaInput = function(cm) {
	  this.cm = cm;
	  // See input.poll and input.reset
	  this.prevInput = "";

	  // Flag that indicates whether we expect input to appear real soon
	  // now (after some event like 'keypress' or 'input') and are
	  // polling intensively.
	  this.pollingFast = false;
	  // Self-resetting timeout for the poller
	  this.polling = new Delayed();
	  // Used to work around IE issue with selection being forgotten when focus moves away from textarea
	  this.hasSelection = false;
	  this.composing = null;
	};

	TextareaInput.prototype.init = function (display) {
	    var this$1 = this;

	  var input = this, cm = this.cm;

	  // Wraps and hides input textarea
	  var div = this.wrapper = hiddenTextarea();
	  // The semihidden textarea that is focused when the editor is
	  // focused, and receives input.
	  var te = this.textarea = div.firstChild;
	  display.wrapper.insertBefore(div, display.wrapper.firstChild);

	  // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
	  if (ios) { te.style.width = "0px"; }

	  on(te, "input", function () {
	    if (ie && ie_version >= 9 && this$1.hasSelection) { this$1.hasSelection = null; }
	    input.poll();
	  });

	  on(te, "paste", function (e) {
	    if (signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }

	    cm.state.pasteIncoming = true;
	    input.fastPoll();
	  });

	  function prepareCopyCut(e) {
	    if (signalDOMEvent(cm, e)) { return }
	    if (cm.somethingSelected()) {
	      setLastCopied({lineWise: false, text: cm.getSelections()});
	    } else if (!cm.options.lineWiseCopyCut) {
	      return
	    } else {
	      var ranges = copyableRanges(cm);
	      setLastCopied({lineWise: true, text: ranges.text});
	      if (e.type == "cut") {
	        cm.setSelections(ranges.ranges, null, sel_dontScroll);
	      } else {
	        input.prevInput = "";
	        te.value = ranges.text.join("\n");
	        selectInput(te);
	      }
	    }
	    if (e.type == "cut") { cm.state.cutIncoming = true; }
	  }
	  on(te, "cut", prepareCopyCut);
	  on(te, "copy", prepareCopyCut);

	  on(display.scroller, "paste", function (e) {
	    if (eventInWidget(display, e) || signalDOMEvent(cm, e)) { return }
	    cm.state.pasteIncoming = true;
	    input.focus();
	  });

	  // Prevent normal selection in the editor (we handle our own)
	  on(display.lineSpace, "selectstart", function (e) {
	    if (!eventInWidget(display, e)) { e_preventDefault(e); }
	  });

	  on(te, "compositionstart", function () {
	    var start = cm.getCursor("from");
	    if (input.composing) { input.composing.range.clear(); }
	    input.composing = {
	      start: start,
	      range: cm.markText(start, cm.getCursor("to"), {className: "CodeMirror-composing"})
	    };
	  });
	  on(te, "compositionend", function () {
	    if (input.composing) {
	      input.poll();
	      input.composing.range.clear();
	      input.composing = null;
	    }
	  });
	};

	TextareaInput.prototype.prepareSelection = function () {
	  // Redraw the selection and/or cursor
	  var cm = this.cm, display = cm.display, doc = cm.doc;
	  var result = prepareSelection(cm);

	  // Move the hidden textarea near the cursor to prevent scrolling artifacts
	  if (cm.options.moveInputWithCursor) {
	    var headPos = cursorCoords(cm, doc.sel.primary().head, "div");
	    var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect();
	    result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
	                                        headPos.top + lineOff.top - wrapOff.top));
	    result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
	                                         headPos.left + lineOff.left - wrapOff.left));
	  }

	  return result
	};

	TextareaInput.prototype.showSelection = function (drawn) {
	  var cm = this.cm, display = cm.display;
	  removeChildrenAndAdd(display.cursorDiv, drawn.cursors);
	  removeChildrenAndAdd(display.selectionDiv, drawn.selection);
	  if (drawn.teTop != null) {
	    this.wrapper.style.top = drawn.teTop + "px";
	    this.wrapper.style.left = drawn.teLeft + "px";
	  }
	};

	// Reset the input to correspond to the selection (or to be empty,
	// when not typing and nothing is selected)
	TextareaInput.prototype.reset = function (typing) {
	  if (this.contextMenuPending || this.composing) { return }
	  var cm = this.cm;
	  if (cm.somethingSelected()) {
	    this.prevInput = "";
	    var content = cm.getSelection();
	    this.textarea.value = content;
	    if (cm.state.focused) { selectInput(this.textarea); }
	    if (ie && ie_version >= 9) { this.hasSelection = content; }
	  } else if (!typing) {
	    this.prevInput = this.textarea.value = "";
	    if (ie && ie_version >= 9) { this.hasSelection = null; }
	  }
	};

	TextareaInput.prototype.getField = function () { return this.textarea };

	TextareaInput.prototype.supportsTouch = function () { return false };

	TextareaInput.prototype.focus = function () {
	  if (this.cm.options.readOnly != "nocursor" && (!mobile || activeElt() != this.textarea)) {
	    try { this.textarea.focus(); }
	    catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM
	  }
	};

	TextareaInput.prototype.blur = function () { this.textarea.blur(); };

	TextareaInput.prototype.resetPosition = function () {
	  this.wrapper.style.top = this.wrapper.style.left = 0;
	};

	TextareaInput.prototype.receivedFocus = function () { this.slowPoll(); };

	// Poll for input changes, using the normal rate of polling. This
	// runs as long as the editor is focused.
	TextareaInput.prototype.slowPoll = function () {
	    var this$1 = this;

	  if (this.pollingFast) { return }
	  this.polling.set(this.cm.options.pollInterval, function () {
	    this$1.poll();
	    if (this$1.cm.state.focused) { this$1.slowPoll(); }
	  });
	};

	// When an event has just come in that is likely to add or change
	// something in the input textarea, we poll faster, to ensure that
	// the change appears on the screen quickly.
	TextareaInput.prototype.fastPoll = function () {
	  var missed = false, input = this;
	  input.pollingFast = true;
	  function p() {
	    var changed = input.poll();
	    if (!changed && !missed) {missed = true; input.polling.set(60, p);}
	    else {input.pollingFast = false; input.slowPoll();}
	  }
	  input.polling.set(20, p);
	};

	// Read input from the textarea, and update the document to match.
	// When something is selected, it is present in the textarea, and
	// selected (unless it is huge, in which case a placeholder is
	// used). When nothing is selected, the cursor sits after previously
	// seen text (can be empty), which is stored in prevInput (we must
	// not reset the textarea when typing, because that breaks IME).
	TextareaInput.prototype.poll = function () {
	    var this$1 = this;

	  var cm = this.cm, input = this.textarea, prevInput = this.prevInput;
	  // Since this is called a *lot*, try to bail out as cheaply as
	  // possible when it is clear that nothing happened. hasSelection
	  // will be the case when there is a lot of text in the textarea,
	  // in which case reading its value would be expensive.
	  if (this.contextMenuPending || !cm.state.focused ||
	      (hasSelection(input) && !prevInput && !this.composing) ||
	      cm.isReadOnly() || cm.options.disableInput || cm.state.keySeq)
	    { return false }

	  var text = input.value;
	  // If nothing changed, bail.
	  if (text == prevInput && !cm.somethingSelected()) { return false }
	  // Work around nonsensical selection resetting in IE9/10, and
	  // inexplicable appearance of private area unicode characters on
	  // some key combos in Mac (#2689).
	  if (ie && ie_version >= 9 && this.hasSelection === text ||
	      mac && /[\uf700-\uf7ff]/.test(text)) {
	    cm.display.input.reset();
	    return false
	  }

	  if (cm.doc.sel == cm.display.selForContextMenu) {
	    var first = text.charCodeAt(0);
	    if (first == 0x200b && !prevInput) { prevInput = "\u200b"; }
	    if (first == 0x21da) { this.reset(); return this.cm.execCommand("undo") }
	  }
	  // Find the part of the input that is actually new
	  var same = 0, l = Math.min(prevInput.length, text.length);
	  while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) { ++same; }

	  runInOp(cm, function () {
	    applyTextInput(cm, text.slice(same), prevInput.length - same,
	                   null, this$1.composing ? "*compose" : null);

	    // Don't leave long text in the textarea, since it makes further polling slow
	    if (text.length > 1000 || text.indexOf("\n") > -1) { input.value = this$1.prevInput = ""; }
	    else { this$1.prevInput = text; }

	    if (this$1.composing) {
	      this$1.composing.range.clear();
	      this$1.composing.range = cm.markText(this$1.composing.start, cm.getCursor("to"),
	                                         {className: "CodeMirror-composing"});
	    }
	  });
	  return true
	};

	TextareaInput.prototype.ensurePolled = function () {
	  if (this.pollingFast && this.poll()) { this.pollingFast = false; }
	};

	TextareaInput.prototype.onKeyPress = function () {
	  if (ie && ie_version >= 9) { this.hasSelection = null; }
	  this.fastPoll();
	};

	TextareaInput.prototype.onContextMenu = function (e) {
	  var input = this, cm = input.cm, display = cm.display, te = input.textarea;
	  var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;
	  if (!pos || presto) { return } // Opera is difficult.

	  // Reset the current text selection only if the click is done outside of the selection
	  // and 'resetSelectionOnContextMenu' option is true.
	  var reset = cm.options.resetSelectionOnContextMenu;
	  if (reset && cm.doc.sel.contains(pos) == -1)
	    { operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll); }

	  var oldCSS = te.style.cssText, oldWrapperCSS = input.wrapper.style.cssText;
	  input.wrapper.style.cssText = "position: absolute";
	  var wrapperBox = input.wrapper.getBoundingClientRect();
	  te.style.cssText = "position: absolute; width: 30px; height: 30px;\n      top: " + (e.clientY - wrapperBox.top - 5) + "px; left: " + (e.clientX - wrapperBox.left - 5) + "px;\n      z-index: 1000; background: " + (ie ? "rgba(255, 255, 255, .05)" : "transparent") + ";\n      outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);";
	  var oldScrollY;
	  if (webkit) { oldScrollY = window.scrollY; } // Work around Chrome issue (#2712)
	  display.input.focus();
	  if (webkit) { window.scrollTo(null, oldScrollY); }
	  display.input.reset();
	  // Adds "Select all" to context menu in FF
	  if (!cm.somethingSelected()) { te.value = input.prevInput = " "; }
	  input.contextMenuPending = true;
	  display.selForContextMenu = cm.doc.sel;
	  clearTimeout(display.detectingSelectAll);

	  // Select-all will be greyed out if there's nothing to select, so
	  // this adds a zero-width space so that we can later check whether
	  // it got selected.
	  function prepareSelectAllHack() {
	    if (te.selectionStart != null) {
	      var selected = cm.somethingSelected();
	      var extval = "\u200b" + (selected ? te.value : "");
	      te.value = "\u21da"; // Used to catch context-menu undo
	      te.value = extval;
	      input.prevInput = selected ? "" : "\u200b";
	      te.selectionStart = 1; te.selectionEnd = extval.length;
	      // Re-set this, in case some other handler touched the
	      // selection in the meantime.
	      display.selForContextMenu = cm.doc.sel;
	    }
	  }
	  function rehide() {
	    input.contextMenuPending = false;
	    input.wrapper.style.cssText = oldWrapperCSS;
	    te.style.cssText = oldCSS;
	    if (ie && ie_version < 9) { display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos); }

	    // Try to detect the user choosing select-all
	    if (te.selectionStart != null) {
	      if (!ie || (ie && ie_version < 9)) { prepareSelectAllHack(); }
	      var i = 0, poll = function () {
	        if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&
	            te.selectionEnd > 0 && input.prevInput == "\u200b") {
	          operation(cm, selectAll)(cm);
	        } else if (i++ < 10) {
	          display.detectingSelectAll = setTimeout(poll, 500);
	        } else {
	          display.selForContextMenu = null;
	          display.input.reset();
	        }
	      };
	      display.detectingSelectAll = setTimeout(poll, 200);
	    }
	  }

	  if (ie && ie_version >= 9) { prepareSelectAllHack(); }
	  if (captureRightClick) {
	    e_stop(e);
	    var mouseup = function () {
	      off(window, "mouseup", mouseup);
	      setTimeout(rehide, 20);
	    };
	    on(window, "mouseup", mouseup);
	  } else {
	    setTimeout(rehide, 50);
	  }
	};

	TextareaInput.prototype.readOnlyChanged = function (val) {
	  if (!val) { this.reset(); }
	  this.textarea.disabled = val == "nocursor";
	};

	TextareaInput.prototype.setUneditable = function () {};

	TextareaInput.prototype.needsContentAttribute = false;

	function fromTextArea(textarea, options) {
	  options = options ? copyObj(options) : {};
	  options.value = textarea.value;
	  if (!options.tabindex && textarea.tabIndex)
	    { options.tabindex = textarea.tabIndex; }
	  if (!options.placeholder && textarea.placeholder)
	    { options.placeholder = textarea.placeholder; }
	  // Set autofocus to true if this textarea is focused, or if it has
	  // autofocus and no other element is focused.
	  if (options.autofocus == null) {
	    var hasFocus = activeElt();
	    options.autofocus = hasFocus == textarea ||
	      textarea.getAttribute("autofocus") != null && hasFocus == document.body;
	  }

	  function save() {textarea.value = cm.getValue();}

	  var realSubmit;
	  if (textarea.form) {
	    on(textarea.form, "submit", save);
	    // Deplorable hack to make the submit method do the right thing.
	    if (!options.leaveSubmitMethodAlone) {
	      var form = textarea.form;
	      realSubmit = form.submit;
	      try {
	        var wrappedSubmit = form.submit = function () {
	          save();
	          form.submit = realSubmit;
	          form.submit();
	          form.submit = wrappedSubmit;
	        };
	      } catch(e) {}
	    }
	  }

	  options.finishInit = function (cm) {
	    cm.save = save;
	    cm.getTextArea = function () { return textarea; };
	    cm.toTextArea = function () {
	      cm.toTextArea = isNaN; // Prevent this from being ran twice
	      save();
	      textarea.parentNode.removeChild(cm.getWrapperElement());
	      textarea.style.display = "";
	      if (textarea.form) {
	        off(textarea.form, "submit", save);
	        if (typeof textarea.form.submit == "function")
	          { textarea.form.submit = realSubmit; }
	      }
	    };
	  };

	  textarea.style.display = "none";
	  var cm = CodeMirror$1(function (node) { return textarea.parentNode.insertBefore(node, textarea.nextSibling); },
	    options);
	  return cm
	}

	function addLegacyProps(CodeMirror) {
	  CodeMirror.off = off;
	  CodeMirror.on = on;
	  CodeMirror.wheelEventPixels = wheelEventPixels;
	  CodeMirror.Doc = Doc;
	  CodeMirror.splitLines = splitLinesAuto;
	  CodeMirror.countColumn = countColumn;
	  CodeMirror.findColumn = findColumn;
	  CodeMirror.isWordChar = isWordCharBasic;
	  CodeMirror.Pass = Pass;
	  CodeMirror.signal = signal;
	  CodeMirror.Line = Line;
	  CodeMirror.changeEnd = changeEnd;
	  CodeMirror.scrollbarModel = scrollbarModel;
	  CodeMirror.Pos = Pos;
	  CodeMirror.cmpPos = cmp;
	  CodeMirror.modes = modes;
	  CodeMirror.mimeModes = mimeModes;
	  CodeMirror.resolveMode = resolveMode;
	  CodeMirror.getMode = getMode;
	  CodeMirror.modeExtensions = modeExtensions;
	  CodeMirror.extendMode = extendMode;
	  CodeMirror.copyState = copyState;
	  CodeMirror.startState = startState;
	  CodeMirror.innerMode = innerMode;
	  CodeMirror.commands = commands;
	  CodeMirror.keyMap = keyMap;
	  CodeMirror.keyName = keyName;
	  CodeMirror.isModifierKey = isModifierKey;
	  CodeMirror.lookupKey = lookupKey;
	  CodeMirror.normalizeKeyMap = normalizeKeyMap;
	  CodeMirror.StringStream = StringStream;
	  CodeMirror.SharedTextMarker = SharedTextMarker;
	  CodeMirror.TextMarker = TextMarker;
	  CodeMirror.LineWidget = LineWidget;
	  CodeMirror.e_preventDefault = e_preventDefault;
	  CodeMirror.e_stopPropagation = e_stopPropagation;
	  CodeMirror.e_stop = e_stop;
	  CodeMirror.addClass = addClass;
	  CodeMirror.contains = contains;
	  CodeMirror.rmClass = rmClass;
	  CodeMirror.keyNames = keyNames;
	}

	// EDITOR CONSTRUCTOR

	defineOptions(CodeMirror$1);

	addEditorMethods(CodeMirror$1);

	// Set up methods on CodeMirror's prototype to redirect to the editor's document.
	var dontDelegate = "iter insert remove copy getEditor constructor".split(" ");
	for (var prop in Doc.prototype) { if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)
	  { CodeMirror$1.prototype[prop] = (function(method) {
	    return function() {return method.apply(this.doc, arguments)}
	  })(Doc.prototype[prop]); } }

	eventMixin(Doc);

	// INPUT HANDLING

	CodeMirror$1.inputStyles = {"textarea": TextareaInput, "contenteditable": ContentEditableInput};

	// MODE DEFINITION AND QUERYING

	// Extra arguments are stored as the mode's dependencies, which is
	// used by (legacy) mechanisms like loadmode.js to automatically
	// load a mode. (Preferred mechanism is the require/define calls.)
	CodeMirror$1.defineMode = function(name/*, mode, …*/) {
	  if (!CodeMirror$1.defaults.mode && name != "null") { CodeMirror$1.defaults.mode = name; }
	  defineMode.apply(this, arguments);
	};

	CodeMirror$1.defineMIME = defineMIME;

	// Minimal default mode.
	CodeMirror$1.defineMode("null", function () { return ({token: function (stream) { return stream.skipToEnd(); }}); });
	CodeMirror$1.defineMIME("text/plain", "null");

	// EXTENSIONS

	CodeMirror$1.defineExtension = function (name, func) {
	  CodeMirror$1.prototype[name] = func;
	};
	CodeMirror$1.defineDocExtension = function (name, func) {
	  Doc.prototype[name] = func;
	};

	CodeMirror$1.fromTextArea = fromTextArea;

	addLegacyProps(CodeMirror$1);

	CodeMirror$1.version = "5.28.0";

	return CodeMirror$1;

	})));


/***/ },

/***/ 552:
/***/ function(module, exports, __webpack_require__) {

	// CodeMirror, copyright (c) by Marijn Haverbeke and others
	// Distributed under an MIT license: http://codemirror.net/LICENSE

	(function(mod) {
	  if (true) // CommonJS
	    mod(__webpack_require__(550));
	  else if (typeof define == "function" && define.amd) // AMD
	    define(["../../lib/codemirror"], mod);
	  else // Plain browser env
	    mod(CodeMirror);
	})(function(CodeMirror) {
	"use strict";

	CodeMirror.defineMode("css", function(config, parserConfig) {
	  var inline = parserConfig.inline
	  if (!parserConfig.propertyKeywords) parserConfig = CodeMirror.resolveMode("text/css");

	  var indentUnit = config.indentUnit,
	      tokenHooks = parserConfig.tokenHooks,
	      documentTypes = parserConfig.documentTypes || {},
	      mediaTypes = parserConfig.mediaTypes || {},
	      mediaFeatures = parserConfig.mediaFeatures || {},
	      mediaValueKeywords = parserConfig.mediaValueKeywords || {},
	      propertyKeywords = parserConfig.propertyKeywords || {},
	      nonStandardPropertyKeywords = parserConfig.nonStandardPropertyKeywords || {},
	      fontProperties = parserConfig.fontProperties || {},
	      counterDescriptors = parserConfig.counterDescriptors || {},
	      colorKeywords = parserConfig.colorKeywords || {},
	      valueKeywords = parserConfig.valueKeywords || {},
	      allowNested = parserConfig.allowNested,
	      lineComment = parserConfig.lineComment,
	      supportsAtComponent = parserConfig.supportsAtComponent === true;

	  var type, override;
	  function ret(style, tp) { type = tp; return style; }

	  // Tokenizers

	  function tokenBase(stream, state) {
	    var ch = stream.next();
	    if (tokenHooks[ch]) {
	      var result = tokenHooks[ch](stream, state);
	      if (result !== false) return result;
	    }
	    if (ch == "@") {
	      stream.eatWhile(/[\w\\\-]/);
	      return ret("def", stream.current());
	    } else if (ch == "=" || (ch == "~" || ch == "|") && stream.eat("=")) {
	      return ret(null, "compare");
	    } else if (ch == "\"" || ch == "'") {
	      state.tokenize = tokenString(ch);
	      return state.tokenize(stream, state);
	    } else if (ch == "#") {
	      stream.eatWhile(/[\w\\\-]/);
	      return ret("atom", "hash");
	    } else if (ch == "!") {
	      stream.match(/^\s*\w*/);
	      return ret("keyword", "important");
	    } else if (/\d/.test(ch) || ch == "." && stream.eat(/\d/)) {
	      stream.eatWhile(/[\w.%]/);
	      return ret("number", "unit");
	    } else if (ch === "-") {
	      if (/[\d.]/.test(stream.peek())) {
	        stream.eatWhile(/[\w.%]/);
	        return ret("number", "unit");
	      } else if (stream.match(/^-[\w\\\-]+/)) {
	        stream.eatWhile(/[\w\\\-]/);
	        if (stream.match(/^\s*:/, false))
	          return ret("variable-2", "variable-definition");
	        return ret("variable-2", "variable");
	      } else if (stream.match(/^\w+-/)) {
	        return ret("meta", "meta");
	      }
	    } else if (/[,+>*\/]/.test(ch)) {
	      return ret(null, "select-op");
	    } else if (ch == "." && stream.match(/^-?[_a-z][_a-z0-9-]*/i)) {
	      return ret("qualifier", "qualifier");
	    } else if (/[:;{}\[\]\(\)]/.test(ch)) {
	      return ret(null, ch);
	    } else if ((ch == "u" && stream.match(/rl(-prefix)?\(/)) ||
	               (ch == "d" && stream.match("omain(")) ||
	               (ch == "r" && stream.match("egexp("))) {
	      stream.backUp(1);
	      state.tokenize = tokenParenthesized;
	      return ret("property", "word");
	    } else if (/[\w\\\-]/.test(ch)) {
	      stream.eatWhile(/[\w\\\-]/);
	      return ret("property", "word");
	    } else {
	      return ret(null, null);
	    }
	  }

	  function tokenString(quote) {
	    return function(stream, state) {
	      var escaped = false, ch;
	      while ((ch = stream.next()) != null) {
	        if (ch == quote && !escaped) {
	          if (quote == ")") stream.backUp(1);
	          break;
	        }
	        escaped = !escaped && ch == "\\";
	      }
	      if (ch == quote || !escaped && quote != ")") state.tokenize = null;
	      return ret("string", "string");
	    };
	  }

	  function tokenParenthesized(stream, state) {
	    stream.next(); // Must be '('
	    if (!stream.match(/\s*[\"\')]/, false))
	      state.tokenize = tokenString(")");
	    else
	      state.tokenize = null;
	    return ret(null, "(");
	  }

	  // Context management

	  function Context(type, indent, prev) {
	    this.type = type;
	    this.indent = indent;
	    this.prev = prev;
	  }

	  function pushContext(state, stream, type, indent) {
	    state.context = new Context(type, stream.indentation() + (indent === false ? 0 : indentUnit), state.context);
	    return type;
	  }

	  function popContext(state) {
	    if (state.context.prev)
	      state.context = state.context.prev;
	    return state.context.type;
	  }

	  function pass(type, stream, state) {
	    return states[state.context.type](type, stream, state);
	  }
	  function popAndPass(type, stream, state, n) {
	    for (var i = n || 1; i > 0; i--)
	      state.context = state.context.prev;
	    return pass(type, stream, state);
	  }

	  // Parser

	  function wordAsValue(stream) {
	    var word = stream.current().toLowerCase();
	    if (valueKeywords.hasOwnProperty(word))
	      override = "atom";
	    else if (colorKeywords.hasOwnProperty(word))
	      override = "keyword";
	    else
	      override = "variable";
	  }

	  var states = {};

	  states.top = function(type, stream, state) {
	    if (type == "{") {
	      return pushContext(state, stream, "block");
	    } else if (type == "}" && state.context.prev) {
	      return popContext(state);
	    } else if (supportsAtComponent && /@component/.test(type)) {
	      return pushContext(state, stream, "atComponentBlock");
	    } else if (/^@(-moz-)?document$/.test(type)) {
	      return pushContext(state, stream, "documentTypes");
	    } else if (/^@(media|supports|(-moz-)?document|import)$/.test(type)) {
	      return pushContext(state, stream, "atBlock");
	    } else if (/^@(font-face|counter-style)/.test(type)) {
	      state.stateArg = type;
	      return "restricted_atBlock_before";
	    } else if (/^@(-(moz|ms|o|webkit)-)?keyframes$/.test(type)) {
	      return "keyframes";
	    } else if (type && type.charAt(0) == "@") {
	      return pushContext(state, stream, "at");
	    } else if (type == "hash") {
	      override = "builtin";
	    } else if (type == "word") {
	      override = "tag";
	    } else if (type == "variable-definition") {
	      return "maybeprop";
	    } else if (type == "interpolation") {
	      return pushContext(state, stream, "interpolation");
	    } else if (type == ":") {
	      return "pseudo";
	    } else if (allowNested && type == "(") {
	      return pushContext(state, stream, "parens");
	    }
	    return state.context.type;
	  };

	  states.block = function(type, stream, state) {
	    if (type == "word") {
	      var word = stream.current().toLowerCase();
	      if (propertyKeywords.hasOwnProperty(word)) {
	        override = "property";
	        return "maybeprop";
	      } else if (nonStandardPropertyKeywords.hasOwnProperty(word)) {
	        override = "string-2";
	        return "maybeprop";
	      } else if (allowNested) {
	        override = stream.match(/^\s*:(?:\s|$)/, false) ? "property" : "tag";
	        return "block";
	      } else {
	        override += " error";
	        return "maybeprop";
	      }
	    } else if (type == "meta") {
	      return "block";
	    } else if (!allowNested && (type == "hash" || type == "qualifier")) {
	      override = "error";
	      return "block";
	    } else {
	      return states.top(type, stream, state);
	    }
	  };

	  states.maybeprop = function(type, stream, state) {
	    if (type == ":") return pushContext(state, stream, "prop");
	    return pass(type, stream, state);
	  };

	  states.prop = function(type, stream, state) {
	    if (type == ";") return popContext(state);
	    if (type == "{" && allowNested) return pushContext(state, stream, "propBlock");
	    if (type == "}" || type == "{") return popAndPass(type, stream, state);
	    if (type == "(") return pushContext(state, stream, "parens");

	    if (type == "hash" && !/^#([0-9a-fA-f]{3,4}|[0-9a-fA-f]{6}|[0-9a-fA-f]{8})$/.test(stream.current())) {
	      override += " error";
	    } else if (type == "word") {
	      wordAsValue(stream);
	    } else if (type == "interpolation") {
	      return pushContext(state, stream, "interpolation");
	    }
	    return "prop";
	  };

	  states.propBlock = function(type, _stream, state) {
	    if (type == "}") return popContext(state);
	    if (type == "word") { override = "property"; return "maybeprop"; }
	    return state.context.type;
	  };

	  states.parens = function(type, stream, state) {
	    if (type == "{" || type == "}") return popAndPass(type, stream, state);
	    if (type == ")") return popContext(state);
	    if (type == "(") return pushContext(state, stream, "parens");
	    if (type == "interpolation") return pushContext(state, stream, "interpolation");
	    if (type == "word") wordAsValue(stream);
	    return "parens";
	  };

	  states.pseudo = function(type, stream, state) {
	    if (type == "meta") return "pseudo";

	    if (type == "word") {
	      override = "variable-3";
	      return state.context.type;
	    }
	    return pass(type, stream, state);
	  };

	  states.documentTypes = function(type, stream, state) {
	    if (type == "word" && documentTypes.hasOwnProperty(stream.current())) {
	      override = "tag";
	      return state.context.type;
	    } else {
	      return states.atBlock(type, stream, state);
	    }
	  };

	  states.atBlock = function(type, stream, state) {
	    if (type == "(") return pushContext(state, stream, "atBlock_parens");
	    if (type == "}" || type == ";") return popAndPass(type, stream, state);
	    if (type == "{") return popContext(state) && pushContext(state, stream, allowNested ? "block" : "top");

	    if (type == "interpolation") return pushContext(state, stream, "interpolation");

	    if (type == "word") {
	      var word = stream.current().toLowerCase();
	      if (word == "only" || word == "not" || word == "and" || word == "or")
	        override = "keyword";
	      else if (mediaTypes.hasOwnProperty(word))
	        override = "attribute";
	      else if (mediaFeatures.hasOwnProperty(word))
	        override = "property";
	      else if (mediaValueKeywords.hasOwnProperty(word))
	        override = "keyword";
	      else if (propertyKeywords.hasOwnProperty(word))
	        override = "property";
	      else if (nonStandardPropertyKeywords.hasOwnProperty(word))
	        override = "string-2";
	      else if (valueKeywords.hasOwnProperty(word))
	        override = "atom";
	      else if (colorKeywords.hasOwnProperty(word))
	        override = "keyword";
	      else
	        override = "error";
	    }
	    return state.context.type;
	  };

	  states.atComponentBlock = function(type, stream, state) {
	    if (type == "}")
	      return popAndPass(type, stream, state);
	    if (type == "{")
	      return popContext(state) && pushContext(state, stream, allowNested ? "block" : "top", false);
	    if (type == "word")
	      override = "error";
	    return state.context.type;
	  };

	  states.atBlock_parens = function(type, stream, state) {
	    if (type == ")") return popContext(state);
	    if (type == "{" || type == "}") return popAndPass(type, stream, state, 2);
	    return states.atBlock(type, stream, state);
	  };

	  states.restricted_atBlock_before = function(type, stream, state) {
	    if (type == "{")
	      return pushContext(state, stream, "restricted_atBlock");
	    if (type == "word" && state.stateArg == "@counter-style") {
	      override = "variable";
	      return "restricted_atBlock_before";
	    }
	    return pass(type, stream, state);
	  };

	  states.restricted_atBlock = function(type, stream, state) {
	    if (type == "}") {
	      state.stateArg = null;
	      return popContext(state);
	    }
	    if (type == "word") {
	      if ((state.stateArg == "@font-face" && !fontProperties.hasOwnProperty(stream.current().toLowerCase())) ||
	          (state.stateArg == "@counter-style" && !counterDescriptors.hasOwnProperty(stream.current().toLowerCase())))
	        override = "error";
	      else
	        override = "property";
	      return "maybeprop";
	    }
	    return "restricted_atBlock";
	  };

	  states.keyframes = function(type, stream, state) {
	    if (type == "word") { override = "variable"; return "keyframes"; }
	    if (type == "{") return pushContext(state, stream, "top");
	    return pass(type, stream, state);
	  };

	  states.at = function(type, stream, state) {
	    if (type == ";") return popContext(state);
	    if (type == "{" || type == "}") return popAndPass(type, stream, state);
	    if (type == "word") override = "tag";
	    else if (type == "hash") override = "builtin";
	    return "at";
	  };

	  states.interpolation = function(type, stream, state) {
	    if (type == "}") return popContext(state);
	    if (type == "{" || type == ";") return popAndPass(type, stream, state);
	    if (type == "word") override = "variable";
	    else if (type != "variable" && type != "(" && type != ")") override = "error";
	    return "interpolation";
	  };

	  return {
	    startState: function(base) {
	      return {tokenize: null,
	              state: inline ? "block" : "top",
	              stateArg: null,
	              context: new Context(inline ? "block" : "top", base || 0, null)};
	    },

	    token: function(stream, state) {
	      if (!state.tokenize && stream.eatSpace()) return null;
	      var style = (state.tokenize || tokenBase)(stream, state);
	      if (style && typeof style == "object") {
	        type = style[1];
	        style = style[0];
	      }
	      override = style;
	      state.state = states[state.state](type, stream, state);
	      return override;
	    },

	    indent: function(state, textAfter) {
	      var cx = state.context, ch = textAfter && textAfter.charAt(0);
	      var indent = cx.indent;
	      if (cx.type == "prop" && (ch == "}" || ch == ")")) cx = cx.prev;
	      if (cx.prev) {
	        if (ch == "}" && (cx.type == "block" || cx.type == "top" ||
	                          cx.type == "interpolation" || cx.type == "restricted_atBlock")) {
	          // Resume indentation from parent context.
	          cx = cx.prev;
	          indent = cx.indent;
	        } else if (ch == ")" && (cx.type == "parens" || cx.type == "atBlock_parens") ||
	            ch == "{" && (cx.type == "at" || cx.type == "atBlock")) {
	          // Dedent relative to current context.
	          indent = Math.max(0, cx.indent - indentUnit);
	        }
	      }
	      return indent;
	    },

	    electricChars: "}",
	    blockCommentStart: "/*",
	    blockCommentEnd: "*/",
	    lineComment: lineComment,
	    fold: "brace"
	  };
	});

	  function keySet(array) {
	    var keys = {};
	    for (var i = 0; i < array.length; ++i) {
	      keys[array[i].toLowerCase()] = true;
	    }
	    return keys;
	  }

	  var documentTypes_ = [
	    "domain", "regexp", "url", "url-prefix"
	  ], documentTypes = keySet(documentTypes_);

	  var mediaTypes_ = [
	    "all", "aural", "braille", "handheld", "print", "projection", "screen",
	    "tty", "tv", "embossed"
	  ], mediaTypes = keySet(mediaTypes_);

	  var mediaFeatures_ = [
	    "width", "min-width", "max-width", "height", "min-height", "max-height",
	    "device-width", "min-device-width", "max-device-width", "device-height",
	    "min-device-height", "max-device-height", "aspect-ratio",
	    "min-aspect-ratio", "max-aspect-ratio", "device-aspect-ratio",
	    "min-device-aspect-ratio", "max-device-aspect-ratio", "color", "min-color",
	    "max-color", "color-index", "min-color-index", "max-color-index",
	    "monochrome", "min-monochrome", "max-monochrome", "resolution",
	    "min-resolution", "max-resolution", "scan", "grid", "orientation",
	    "device-pixel-ratio", "min-device-pixel-ratio", "max-device-pixel-ratio",
	    "pointer", "any-pointer", "hover", "any-hover"
	  ], mediaFeatures = keySet(mediaFeatures_);

	  var mediaValueKeywords_ = [
	    "landscape", "portrait", "none", "coarse", "fine", "on-demand", "hover",
	    "interlace", "progressive"
	  ], mediaValueKeywords = keySet(mediaValueKeywords_);

	  var propertyKeywords_ = [
	    "align-content", "align-items", "align-self", "alignment-adjust",
	    "alignment-baseline", "anchor-point", "animation", "animation-delay",
	    "animation-direction", "animation-duration", "animation-fill-mode",
	    "animation-iteration-count", "animation-name", "animation-play-state",
	    "animation-timing-function", "appearance", "azimuth", "backface-visibility",
	    "background", "background-attachment", "background-blend-mode", "background-clip",
	    "background-color", "background-image", "background-origin", "background-position",
	    "background-repeat", "background-size", "baseline-shift", "binding",
	    "bleed", "bookmark-label", "bookmark-level", "bookmark-state",
	    "bookmark-target", "border", "border-bottom", "border-bottom-color",
	    "border-bottom-left-radius", "border-bottom-right-radius",
	    "border-bottom-style", "border-bottom-width", "border-collapse",
	    "border-color", "border-image", "border-image-outset",
	    "border-image-repeat", "border-image-slice", "border-image-source",
	    "border-image-width", "border-left", "border-left-color",
	    "border-left-style", "border-left-width", "border-radius", "border-right",
	    "border-right-color", "border-right-style", "border-right-width",
	    "border-spacing", "border-style", "border-top", "border-top-color",
	    "border-top-left-radius", "border-top-right-radius", "border-top-style",
	    "border-top-width", "border-width", "bottom", "box-decoration-break",
	    "box-shadow", "box-sizing", "break-after", "break-before", "break-inside",
	    "caption-side", "caret-color", "clear", "clip", "color", "color-profile", "column-count",
	    "column-fill", "column-gap", "column-rule", "column-rule-color",
	    "column-rule-style", "column-rule-width", "column-span", "column-width",
	    "columns", "content", "counter-increment", "counter-reset", "crop", "cue",
	    "cue-after", "cue-before", "cursor", "direction", "display",
	    "dominant-baseline", "drop-initial-after-adjust",
	    "drop-initial-after-align", "drop-initial-before-adjust",
	    "drop-initial-before-align", "drop-initial-size", "drop-initial-value",
	    "elevation", "empty-cells", "fit", "fit-position", "flex", "flex-basis",
	    "flex-direction", "flex-flow", "flex-grow", "flex-shrink", "flex-wrap",
	    "float", "float-offset", "flow-from", "flow-into", "font", "font-feature-settings",
	    "font-family", "font-kerning", "font-language-override", "font-size", "font-size-adjust",
	    "font-stretch", "font-style", "font-synthesis", "font-variant",
	    "font-variant-alternates", "font-variant-caps", "font-variant-east-asian",
	    "font-variant-ligatures", "font-variant-numeric", "font-variant-position",
	    "font-weight", "grid", "grid-area", "grid-auto-columns", "grid-auto-flow",
	    "grid-auto-rows", "grid-column", "grid-column-end", "grid-column-gap",
	    "grid-column-start", "grid-gap", "grid-row", "grid-row-end", "grid-row-gap",
	    "grid-row-start", "grid-template", "grid-template-areas", "grid-template-columns",
	    "grid-template-rows", "hanging-punctuation", "height", "hyphens",
	    "icon", "image-orientation", "image-rendering", "image-resolution",
	    "inline-box-align", "justify-content", "justify-items", "justify-self", "left", "letter-spacing",
	    "line-break", "line-height", "line-stacking", "line-stacking-ruby",
	    "line-stacking-shift", "line-stacking-strategy", "list-style",
	    "list-style-image", "list-style-position", "list-style-type", "margin",
	    "margin-bottom", "margin-left", "margin-right", "margin-top",
	    "marks", "marquee-direction", "marquee-loop",
	    "marquee-play-count", "marquee-speed", "marquee-style", "max-height",
	    "max-width", "min-height", "min-width", "move-to", "nav-down", "nav-index",
	    "nav-left", "nav-right", "nav-up", "object-fit", "object-position",
	    "opacity", "order", "orphans", "outline",
	    "outline-color", "outline-offset", "outline-style", "outline-width",
	    "overflow", "overflow-style", "overflow-wrap", "overflow-x", "overflow-y",
	    "padding", "padding-bottom", "padding-left", "padding-right", "padding-top",
	    "page", "page-break-after", "page-break-before", "page-break-inside",
	    "page-policy", "pause", "pause-after", "pause-before", "perspective",
	    "perspective-origin", "pitch", "pitch-range", "place-content", "place-items", "place-self", "play-during", "position",
	    "presentation-level", "punctuation-trim", "quotes", "region-break-after",
	    "region-break-before", "region-break-inside", "region-fragment",
	    "rendering-intent", "resize", "rest", "rest-after", "rest-before", "richness",
	    "right", "rotation", "rotation-point", "ruby-align", "ruby-overhang",
	    "ruby-position", "ruby-span", "shape-image-threshold", "shape-inside", "shape-margin",
	    "shape-outside", "size", "speak", "speak-as", "speak-header",
	    "speak-numeral", "speak-punctuation", "speech-rate", "stress", "string-set",
	    "tab-size", "table-layout", "target", "target-name", "target-new",
	    "target-position", "text-align", "text-align-last", "text-decoration",
	    "text-decoration-color", "text-decoration-line", "text-decoration-skip",
	    "text-decoration-style", "text-emphasis", "text-emphasis-color",
	    "text-emphasis-position", "text-emphasis-style", "text-height",
	    "text-indent", "text-justify", "text-outline", "text-overflow", "text-shadow",
	    "text-size-adjust", "text-space-collapse", "text-transform", "text-underline-position",
	    "text-wrap", "top", "transform", "transform-origin", "transform-style",
	    "transition", "transition-delay", "transition-duration",
	    "transition-property", "transition-timing-function", "unicode-bidi",
	    "user-select", "vertical-align", "visibility", "voice-balance", "voice-duration",
	    "voice-family", "voice-pitch", "voice-range", "voice-rate", "voice-stress",
	    "voice-volume", "volume", "white-space", "widows", "width", "will-change", "word-break",
	    "word-spacing", "word-wrap", "z-index",
	    // SVG-specific
	    "clip-path", "clip-rule", "mask", "enable-background", "filter", "flood-color",
	    "flood-opacity", "lighting-color", "stop-color", "stop-opacity", "pointer-events",
	    "color-interpolation", "color-interpolation-filters",
	    "color-rendering", "fill", "fill-opacity", "fill-rule", "image-rendering",
	    "marker", "marker-end", "marker-mid", "marker-start", "shape-rendering", "stroke",
	    "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin",
	    "stroke-miterlimit", "stroke-opacity", "stroke-width", "text-rendering",
	    "baseline-shift", "dominant-baseline", "glyph-orientation-horizontal",
	    "glyph-orientation-vertical", "text-anchor", "writing-mode"
	  ], propertyKeywords = keySet(propertyKeywords_);

	  var nonStandardPropertyKeywords_ = [
	    "scrollbar-arrow-color", "scrollbar-base-color", "scrollbar-dark-shadow-color",
	    "scrollbar-face-color", "scrollbar-highlight-color", "scrollbar-shadow-color",
	    "scrollbar-3d-light-color", "scrollbar-track-color", "shape-inside",
	    "searchfield-cancel-button", "searchfield-decoration", "searchfield-results-button",
	    "searchfield-results-decoration", "zoom"
	  ], nonStandardPropertyKeywords = keySet(nonStandardPropertyKeywords_);

	  var fontProperties_ = [
	    "font-family", "src", "unicode-range", "font-variant", "font-feature-settings",
	    "font-stretch", "font-weight", "font-style"
	  ], fontProperties = keySet(fontProperties_);

	  var counterDescriptors_ = [
	    "additive-symbols", "fallback", "negative", "pad", "prefix", "range",
	    "speak-as", "suffix", "symbols", "system"
	  ], counterDescriptors = keySet(counterDescriptors_);

	  var colorKeywords_ = [
	    "aliceblue", "antiquewhite", "aqua", "aquamarine", "azure", "beige",
	    "bisque", "black", "blanchedalmond", "blue", "blueviolet", "brown",
	    "burlywood", "cadetblue", "chartreuse", "chocolate", "coral", "cornflowerblue",
	    "cornsilk", "crimson", "cyan", "darkblue", "darkcyan", "darkgoldenrod",
	    "darkgray", "darkgreen", "darkkhaki", "darkmagenta", "darkolivegreen",
	    "darkorange", "darkorchid", "darkred", "darksalmon", "darkseagreen",
	    "darkslateblue", "darkslategray", "darkturquoise", "darkviolet",
	    "deeppink", "deepskyblue", "dimgray", "dodgerblue", "firebrick",
	    "floralwhite", "forestgreen", "fuchsia", "gainsboro", "ghostwhite",
	    "gold", "goldenrod", "gray", "grey", "green", "greenyellow", "honeydew",
	    "hotpink", "indianred", "indigo", "ivory", "khaki", "lavender",
	    "lavenderblush", "lawngreen", "lemonchiffon", "lightblue", "lightcoral",
	    "lightcyan", "lightgoldenrodyellow", "lightgray", "lightgreen", "lightpink",
	    "lightsalmon", "lightseagreen", "lightskyblue", "lightslategray",
	    "lightsteelblue", "lightyellow", "lime", "limegreen", "linen", "magenta",
	    "maroon", "mediumaquamarine", "mediumblue", "mediumorchid", "mediumpurple",
	    "mediumseagreen", "mediumslateblue", "mediumspringgreen", "mediumturquoise",
	    "mediumvioletred", "midnightblue", "mintcream", "mistyrose", "moccasin",
	    "navajowhite", "navy", "oldlace", "olive", "olivedrab", "orange", "orangered",
	    "orchid", "palegoldenrod", "palegreen", "paleturquoise", "palevioletred",
	    "papayawhip", "peachpuff", "peru", "pink", "plum", "powderblue",
	    "purple", "rebeccapurple", "red", "rosybrown", "royalblue", "saddlebrown",
	    "salmon", "sandybrown", "seagreen", "seashell", "sienna", "silver", "skyblue",
	    "slateblue", "slategray", "snow", "springgreen", "steelblue", "tan",
	    "teal", "thistle", "tomato", "turquoise", "violet", "wheat", "white",
	    "whitesmoke", "yellow", "yellowgreen"
	  ], colorKeywords = keySet(colorKeywords_);

	  var valueKeywords_ = [
	    "above", "absolute", "activeborder", "additive", "activecaption", "afar",
	    "after-white-space", "ahead", "alias", "all", "all-scroll", "alphabetic", "alternate",
	    "always", "amharic", "amharic-abegede", "antialiased", "appworkspace",
	    "arabic-indic", "armenian", "asterisks", "attr", "auto", "auto-flow", "avoid", "avoid-column", "avoid-page",
	    "avoid-region", "background", "backwards", "baseline", "below", "bidi-override", "binary",
	    "bengali", "blink", "block", "block-axis", "bold", "bolder", "border", "border-box",
	    "both", "bottom", "break", "break-all", "break-word", "bullets", "button", "button-bevel",
	    "buttonface", "buttonhighlight", "buttonshadow", "buttontext", "calc", "cambodian",
	    "capitalize", "caps-lock-indicator", "caption", "captiontext", "caret",
	    "cell", "center", "checkbox", "circle", "cjk-decimal", "cjk-earthly-branch",
	    "cjk-heavenly-stem", "cjk-ideographic", "clear", "clip", "close-quote",
	    "col-resize", "collapse", "color", "color-burn", "color-dodge", "column", "column-reverse",
	    "compact", "condensed", "contain", "content", "contents",
	    "content-box", "context-menu", "continuous", "copy", "counter", "counters", "cover", "crop",
	    "cross", "crosshair", "currentcolor", "cursive", "cyclic", "darken", "dashed", "decimal",
	    "decimal-leading-zero", "default", "default-button", "dense", "destination-atop",
	    "destination-in", "destination-out", "destination-over", "devanagari", "difference",
	    "disc", "discard", "disclosure-closed", "disclosure-open", "document",
	    "dot-dash", "dot-dot-dash",
	    "dotted", "double", "down", "e-resize", "ease", "ease-in", "ease-in-out", "ease-out",
	    "element", "ellipse", "ellipsis", "embed", "end", "ethiopic", "ethiopic-abegede",
	    "ethiopic-abegede-am-et", "ethiopic-abegede-gez", "ethiopic-abegede-ti-er",
	    "ethiopic-abegede-ti-et", "ethiopic-halehame-aa-er",
	    "ethiopic-halehame-aa-et", "ethiopic-halehame-am-et",
	    "ethiopic-halehame-gez", "ethiopic-halehame-om-et",
	    "ethiopic-halehame-sid-et", "ethiopic-halehame-so-et",
	    "ethiopic-halehame-ti-er", "ethiopic-halehame-ti-et", "ethiopic-halehame-tig",
	    "ethiopic-numeric", "ew-resize", "exclusion", "expanded", "extends", "extra-condensed",
	    "extra-expanded", "fantasy", "fast", "fill", "fixed", "flat", "flex", "flex-end", "flex-start", "footnotes",
	    "forwards", "from", "geometricPrecision", "georgian", "graytext", "grid", "groove",
	    "gujarati", "gurmukhi", "hand", "hangul", "hangul-consonant", "hard-light", "hebrew",
	    "help", "hidden", "hide", "higher", "highlight", "highlighttext",
	    "hiragana", "hiragana-iroha", "horizontal", "hsl", "hsla", "hue", "icon", "ignore",
	    "inactiveborder", "inactivecaption", "inactivecaptiontext", "infinite",
	    "infobackground", "infotext", "inherit", "initial", "inline", "inline-axis",
	    "inline-block", "inline-flex", "inline-grid", "inline-table", "inset", "inside", "intrinsic", "invert",
	    "italic", "japanese-formal", "japanese-informal", "justify", "kannada",
	    "katakana", "katakana-iroha", "keep-all", "khmer",
	    "korean-hangul-formal", "korean-hanja-formal", "korean-hanja-informal",
	    "landscape", "lao", "large", "larger", "left", "level", "lighter", "lighten",
	    "line-through", "linear", "linear-gradient", "lines", "list-item", "listbox", "listitem",
	    "local", "logical", "loud", "lower", "lower-alpha", "lower-armenian",
	    "lower-greek", "lower-hexadecimal", "lower-latin", "lower-norwegian",
	    "lower-roman", "lowercase", "ltr", "luminosity", "malayalam", "match", "matrix", "matrix3d",
	    "media-controls-background", "media-current-time-display",
	    "media-fullscreen-button", "media-mute-button", "media-play-button",
	    "media-return-to-realtime-button", "media-rewind-button",
	    "media-seek-back-button", "media-seek-forward-button", "media-slider",
	    "media-sliderthumb", "media-time-remaining-display", "media-volume-slider",
	    "media-volume-slider-container", "media-volume-sliderthumb", "medium",
	    "menu", "menulist", "menulist-button", "menulist-text",
	    "menulist-textfield", "menutext", "message-box", "middle", "min-intrinsic",
	    "mix", "mongolian", "monospace", "move", "multiple", "multiply", "myanmar", "n-resize",
	    "narrower", "ne-resize", "nesw-resize", "no-close-quote", "no-drop",
	    "no-open-quote", "no-repeat", "none", "normal", "not-allowed", "nowrap",
	    "ns-resize", "numbers", "numeric", "nw-resize", "nwse-resize", "oblique", "octal", "opacity", "open-quote",
	    "optimizeLegibility", "optimizeSpeed", "oriya", "oromo", "outset",
	    "outside", "outside-shape", "overlay", "overline", "padding", "padding-box",
	    "painted", "page", "paused", "persian", "perspective", "plus-darker", "plus-lighter",
	    "pointer", "polygon", "portrait", "pre", "pre-line", "pre-wrap", "preserve-3d",
	    "progress", "push-button", "radial-gradient", "radio", "read-only",
	    "read-write", "read-write-plaintext-only", "rectangle", "region",
	    "relative", "repeat", "repeating-linear-gradient",
	    "repeating-radial-gradient", "repeat-x", "repeat-y", "reset", "reverse",
	    "rgb", "rgba", "ridge", "right", "rotate", "rotate3d", "rotateX", "rotateY",
	    "rotateZ", "round", "row", "row-resize", "row-reverse", "rtl", "run-in", "running",
	    "s-resize", "sans-serif", "saturation", "scale", "scale3d", "scaleX", "scaleY", "scaleZ", "screen",
	    "scroll", "scrollbar", "scroll-position", "se-resize", "searchfield",
	    "searchfield-cancel-button", "searchfield-decoration",
	    "searchfield-results-button", "searchfield-results-decoration", "self-start", "self-end",
	    "semi-condensed", "semi-expanded", "separate", "serif", "show", "sidama",
	    "simp-chinese-formal", "simp-chinese-informal", "single",
	    "skew", "skewX", "skewY", "skip-white-space", "slide", "slider-horizontal",
	    "slider-vertical", "sliderthumb-horizontal", "sliderthumb-vertical", "slow",
	    "small", "small-caps", "small-caption", "smaller", "soft-light", "solid", "somali",
	    "source-atop", "source-in", "source-out", "source-over", "space", "space-around", "space-between", "space-evenly", "spell-out", "square",
	    "square-button", "start", "static", "status-bar", "stretch", "stroke", "sub",
	    "subpixel-antialiased", "super", "sw-resize", "symbolic", "symbols", "system-ui", "table",
	    "table-caption", "table-cell", "table-column", "table-column-group",
	    "table-footer-group", "table-header-group", "table-row", "table-row-group",
	    "tamil",
	    "telugu", "text", "text-bottom", "text-top", "textarea", "textfield", "thai",
	    "thick", "thin", "threeddarkshadow", "threedface", "threedhighlight",
	    "threedlightshadow", "threedshadow", "tibetan", "tigre", "tigrinya-er",
	    "tigrinya-er-abegede", "tigrinya-et", "tigrinya-et-abegede", "to", "top",
	    "trad-chinese-formal", "trad-chinese-informal", "transform",
	    "translate", "translate3d", "translateX", "translateY", "translateZ",
	    "transparent", "ultra-condensed", "ultra-expanded", "underline", "unset", "up",
	    "upper-alpha", "upper-armenian", "upper-greek", "upper-hexadecimal",
	    "upper-latin", "upper-norwegian", "upper-roman", "uppercase", "urdu", "url",
	    "var", "vertical", "vertical-text", "visible", "visibleFill", "visiblePainted",
	    "visibleStroke", "visual", "w-resize", "wait", "wave", "wider",
	    "window", "windowframe", "windowtext", "words", "wrap", "wrap-reverse", "x-large", "x-small", "xor",
	    "xx-large", "xx-small"
	  ], valueKeywords = keySet(valueKeywords_);

	  var allWords = documentTypes_.concat(mediaTypes_).concat(mediaFeatures_).concat(mediaValueKeywords_)
	    .concat(propertyKeywords_).concat(nonStandardPropertyKeywords_).concat(colorKeywords_)
	    .concat(valueKeywords_);
	  CodeMirror.registerHelper("hintWords", "css", allWords);

	  function tokenCComment(stream, state) {
	    var maybeEnd = false, ch;
	    while ((ch = stream.next()) != null) {
	      if (maybeEnd && ch == "/") {
	        state.tokenize = null;
	        break;
	      }
	      maybeEnd = (ch == "*");
	    }
	    return ["comment", "comment"];
	  }

	  CodeMirror.defineMIME("text/css", {
	    documentTypes: documentTypes,
	    mediaTypes: mediaTypes,
	    mediaFeatures: mediaFeatures,
	    mediaValueKeywords: mediaValueKeywords,
	    propertyKeywords: propertyKeywords,
	    nonStandardPropertyKeywords: nonStandardPropertyKeywords,
	    fontProperties: fontProperties,
	    counterDescriptors: counterDescriptors,
	    colorKeywords: colorKeywords,
	    valueKeywords: valueKeywords,
	    tokenHooks: {
	      "/": function(stream, state) {
	        if (!stream.eat("*")) return false;
	        state.tokenize = tokenCComment;
	        return tokenCComment(stream, state);
	      }
	    },
	    name: "css"
	  });

	  CodeMirror.defineMIME("text/x-scss", {
	    mediaTypes: mediaTypes,
	    mediaFeatures: mediaFeatures,
	    mediaValueKeywords: mediaValueKeywords,
	    propertyKeywords: propertyKeywords,
	    nonStandardPropertyKeywords: nonStandardPropertyKeywords,
	    colorKeywords: colorKeywords,
	    valueKeywords: valueKeywords,
	    fontProperties: fontProperties,
	    allowNested: true,
	    lineComment: "//",
	    tokenHooks: {
	      "/": function(stream, state) {
	        if (stream.eat("/")) {
	          stream.skipToEnd();
	          return ["comment", "comment"];
	        } else if (stream.eat("*")) {
	          state.tokenize = tokenCComment;
	          return tokenCComment(stream, state);
	        } else {
	          return ["operator", "operator"];
	        }
	      },
	      ":": function(stream) {
	        if (stream.match(/\s*\{/, false))
	          return [null, null]
	        return false;
	      },
	      "$": function(stream) {
	        stream.match(/^[\w-]+/);
	        if (stream.match(/^\s*:/, false))
	          return ["variable-2", "variable-definition"];
	        return ["variable-2", "variable"];
	      },
	      "#": function(stream) {
	        if (!stream.eat("{")) return false;
	        return [null, "interpolation"];
	      }
	    },
	    name: "css",
	    helperType: "scss"
	  });

	  CodeMirror.defineMIME("text/x-less", {
	    mediaTypes: mediaTypes,
	    mediaFeatures: mediaFeatures,
	    mediaValueKeywords: mediaValueKeywords,
	    propertyKeywords: propertyKeywords,
	    nonStandardPropertyKeywords: nonStandardPropertyKeywords,
	    colorKeywords: colorKeywords,
	    valueKeywords: valueKeywords,
	    fontProperties: fontProperties,
	    allowNested: true,
	    lineComment: "//",
	    tokenHooks: {
	      "/": function(stream, state) {
	        if (stream.eat("/")) {
	          stream.skipToEnd();
	          return ["comment", "comment"];
	        } else if (stream.eat("*")) {
	          state.tokenize = tokenCComment;
	          return tokenCComment(stream, state);
	        } else {
	          return ["operator", "operator"];
	        }
	      },
	      "@": function(stream) {
	        if (stream.eat("{")) return [null, "interpolation"];
	        if (stream.match(/^(charset|document|font-face|import|(-(moz|ms|o|webkit)-)?keyframes|media|namespace|page|supports)\b/, false)) return false;
	        stream.eatWhile(/[\w\\\-]/);
	        if (stream.match(/^\s*:/, false))
	          return ["variable-2", "variable-definition"];
	        return ["variable-2", "variable"];
	      },
	      "&": function() {
	        return ["atom", "atom"];
	      }
	    },
	    name: "css",
	    helperType: "less"
	  });

	  CodeMirror.defineMIME("text/x-gss", {
	    documentTypes: documentTypes,
	    mediaTypes: mediaTypes,
	    mediaFeatures: mediaFeatures,
	    propertyKeywords: propertyKeywords,
	    nonStandardPropertyKeywords: nonStandardPropertyKeywords,
	    fontProperties: fontProperties,
	    counterDescriptors: counterDescriptors,
	    colorKeywords: colorKeywords,
	    valueKeywords: valueKeywords,
	    supportsAtComponent: true,
	    tokenHooks: {
	      "/": function(stream, state) {
	        if (!stream.eat("*")) return false;
	        state.tokenize = tokenCComment;
	        return tokenCComment(stream, state);
	      }
	    },
	    name: "css",
	    helperType: "gss"
	  });

	});


/***/ }

});